TY  - JOUR
AU  - Jović, Vladimir D
AU  - Jović, Borka M
AU  - Elezović, Nevenka R.
AU  - Gajić-Krstajić, Ljiljana M
PY  - 2019
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1249
AB  - The "corrected accelerated service life test for hydrogen evolution reaction" (CASLT-HER), designed for application of certain electrode materials as cathodes in the cell for alkaline water electrolysis in 30 % KOH at 80 degrees C, was performed at electrodeposited NiSn alloy and Ni 40 mesh electrodes. The Ni 40 mesh was slightly etched, while the NiSn alloy coating was electro-deposited from the bath containing pyrophosphate, glycine, SnCl2 and NiCl2 onto Ni 40 mesh to the thickness of approximately 40 mu m. It is shown that the NiSn cathode possess from maximum 0.77 V to minimum 0.30 V better over-potential than the Ni 40 mesh electrode during the 5 years of their exploitation at the conditions of industrial alkaline water electrolysis. It is also shown that both electrodes should be held at j = -0.3 A cm(-2) for at least 5 h in order to establish stable overpotential response. The limiting overpotential values for applying cyclic voltammetry (CVs, to mimic "polarity inversion") should be determined in a separate experiment before the CASLT-HER and should be adjusted during the application of CVs.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - Corrected accelerated service life test of electrodeposited NiSn alloys and Ni as cathodes for industrial alkaline water electrolysis
EP  - 1286
IS  - 11
SP  - 1271
VL  - 84
DO  - 10.2298/JSC190515074J
ER  - 

@article{
author = "Jović, Vladimir D and Jović, Borka M and Elezović, Nevenka R. and Gajić-Krstajić, Ljiljana M",
year = "2019",
abstract = "The "corrected accelerated service life test for hydrogen evolution reaction" (CASLT-HER), designed for application of certain electrode materials as cathodes in the cell for alkaline water electrolysis in 30 % KOH at 80 degrees C, was performed at electrodeposited NiSn alloy and Ni 40 mesh electrodes. The Ni 40 mesh was slightly etched, while the NiSn alloy coating was electro-deposited from the bath containing pyrophosphate, glycine, SnCl2 and NiCl2 onto Ni 40 mesh to the thickness of approximately 40 mu m. It is shown that the NiSn cathode possess from maximum 0.77 V to minimum 0.30 V better over-potential than the Ni 40 mesh electrode during the 5 years of their exploitation at the conditions of industrial alkaline water electrolysis. It is also shown that both electrodes should be held at j = -0.3 A cm(-2) for at least 5 h in order to establish stable overpotential response. The limiting overpotential values for applying cyclic voltammetry (CVs, to mimic "polarity inversion") should be determined in a separate experiment before the CASLT-HER and should be adjusted during the application of CVs.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "Corrected accelerated service life test of electrodeposited NiSn alloys and Ni as cathodes for industrial alkaline water electrolysis",
pages = "1286-1271",
number = "11",
volume = "84",
doi = "10.2298/JSC190515074J"
}

Jović, V. D., Jović, B. M., Elezović, N. R.,& Gajić-Krstajić, L. M.. (2019). Corrected accelerated service life test of electrodeposited NiSn alloys and Ni as cathodes for industrial alkaline water electrolysis. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 84(11), 1271-1286.
https://doi.org/10.2298/JSC190515074J

Jović VD, Jović BM, Elezović NR, Gajić-Krstajić LM. Corrected accelerated service life test of electrodeposited NiSn alloys and Ni as cathodes for industrial alkaline water electrolysis. in Journal of the Serbian Chemical Society. 2019;84(11):1271-1286.
doi:10.2298/JSC190515074J .

Jović, Vladimir D, Jović, Borka M, Elezović, Nevenka R., Gajić-Krstajić, Ljiljana M, "Corrected accelerated service life test of electrodeposited NiSn alloys and Ni as cathodes for industrial alkaline water electrolysis" in Journal of the Serbian Chemical Society, 84, no. 11 (2019):1271-1286,
https://doi.org/10.2298/JSC190515074J . .

TY  - JOUR
AU  - Lović, J. D.
AU  - Elezović, Nevenka R.
AU  - Jović, Borka M
AU  - Zabinski, P.
AU  - Gajić-Krstajić, Ljiljana M
AU  - Jović, Vladimir D
PY  - 2018
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1153
AB  - The Pd and three AgPd alloy layers (AgPd1, AgPd2 and AgPd3) were electrodeposited onto Au disc electrodes from the solution containing high concentration of chloride ions (>12 M). All coatings were investigated by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), anodic linear sweep voltammetry (ALSV), while their surface composition was investigated by X-ray photoelectron spectroscopy (XPS). The AgPd1 and AgPd2 samples were electrodeposited at different constant current densities (-0.178 mA cm(-2) and -0.415 mA cm(-2) respectively) to the charge of -0.2 C cm(-2) (thickness similar to 0.18 mu m) at a stationary disc electrode, while the sample AgPd3 was electrodeposited to the charge of -3.0 C cm(-2) (thickness similar to 2.8 mu m) at a constant current density of -7.0 mA cm(-2) under the conditions of convective diffusion. Samples AgPd1 and AgPd2 had similar morphologies of low roughness, while the morphology of AgPd3 was characterized by large crystals and higher roughness. The most active and the most poisoning tolerant coatings for ethanol oxidation reaction (EOR) are the AgPd3 and AgPd1 alloy samples, containing 72.6 at.% Ag - 27.4 at.% Pd and 84.7 at.% Ag - 15.2 at.% Pd respectively (XPS analysis). In this study, we demonstrated for the first time that the activity for the EOR at AgPd alloys was closely related to the amount of non-reduced Ag2O (most probably as Ag - hydroxide). Accordingly, all AgPd alloy samples had to be cycled in the potential region of Ag2O formation and reduction before the investigation of the EOR, in order to provide their catalytic activity towards the EOR.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - International Journal of Hydrogen Energy
T1  - Electrodeposited AgPd alloy coatings as efficient catalysts for the ethanol oxidation reaction
EP  - 18508
IS  - 39
SP  - 18498
VL  - 43
DO  - 10.1016/j.ijhydene.2018.08.056
ER  - 

@article{
author = "Lović, J. D. and Elezović, Nevenka R. and Jović, Borka M and Zabinski, P. and Gajić-Krstajić, Ljiljana M and Jović, Vladimir D",
year = "2018",
abstract = "The Pd and three AgPd alloy layers (AgPd1, AgPd2 and AgPd3) were electrodeposited onto Au disc electrodes from the solution containing high concentration of chloride ions (>12 M). All coatings were investigated by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), anodic linear sweep voltammetry (ALSV), while their surface composition was investigated by X-ray photoelectron spectroscopy (XPS). The AgPd1 and AgPd2 samples were electrodeposited at different constant current densities (-0.178 mA cm(-2) and -0.415 mA cm(-2) respectively) to the charge of -0.2 C cm(-2) (thickness similar to 0.18 mu m) at a stationary disc electrode, while the sample AgPd3 was electrodeposited to the charge of -3.0 C cm(-2) (thickness similar to 2.8 mu m) at a constant current density of -7.0 mA cm(-2) under the conditions of convective diffusion. Samples AgPd1 and AgPd2 had similar morphologies of low roughness, while the morphology of AgPd3 was characterized by large crystals and higher roughness. The most active and the most poisoning tolerant coatings for ethanol oxidation reaction (EOR) are the AgPd3 and AgPd1 alloy samples, containing 72.6 at.% Ag - 27.4 at.% Pd and 84.7 at.% Ag - 15.2 at.% Pd respectively (XPS analysis). In this study, we demonstrated for the first time that the activity for the EOR at AgPd alloys was closely related to the amount of non-reduced Ag2O (most probably as Ag - hydroxide). Accordingly, all AgPd alloy samples had to be cycled in the potential region of Ag2O formation and reduction before the investigation of the EOR, in order to provide their catalytic activity towards the EOR.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "International Journal of Hydrogen Energy",
title = "Electrodeposited AgPd alloy coatings as efficient catalysts for the ethanol oxidation reaction",
pages = "18508-18498",
number = "39",
volume = "43",
doi = "10.1016/j.ijhydene.2018.08.056"
}

Lović, J. D., Elezović, N. R., Jović, B. M., Zabinski, P., Gajić-Krstajić, L. M.,& Jović, V. D.. (2018). Electrodeposited AgPd alloy coatings as efficient catalysts for the ethanol oxidation reaction. in International Journal of Hydrogen Energy
Pergamon-Elsevier Science Ltd, Oxford., 43(39), 18498-18508.
https://doi.org/10.1016/j.ijhydene.2018.08.056

Lović JD, Elezović NR, Jović BM, Zabinski P, Gajić-Krstajić LM, Jović VD. Electrodeposited AgPd alloy coatings as efficient catalysts for the ethanol oxidation reaction. in International Journal of Hydrogen Energy. 2018;43(39):18498-18508.
doi:10.1016/j.ijhydene.2018.08.056 .

Lović, J. D., Elezović, Nevenka R., Jović, Borka M, Zabinski, P., Gajić-Krstajić, Ljiljana M, Jović, Vladimir D, "Electrodeposited AgPd alloy coatings as efficient catalysts for the ethanol oxidation reaction" in International Journal of Hydrogen Energy, 43, no. 39 (2018):18498-18508,
https://doi.org/10.1016/j.ijhydene.2018.08.056 . .

TY  - JOUR
AU  - Jović, Borka M
AU  - Lačnjevac, Uroš
AU  - Jović, Vladimir D
AU  - Gajić-Krstajić, Ljiljana M
AU  - Kovač, Janez
AU  - Poleti, Dejan
AU  - Krstajić, Nedeljko V
PY  - 2016
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/975
AB  - The oxygen evolution reaction (OER) was studied at pure Ni and Ni-(Ebonex/Ir) composite coatings in 1 M NaOH solution at 25 degrees C. Ni-(Ebonex-supported Ir) coatings were electro-deposited from a nickel Watts bath containing different concentrations of suspended Ebonex/Ir particles (0-2 g dm(-3)) onto a Ni 40 mesh substrate. The surface morphology of the coatings was examined by scanning electron microscopy (SEM), the surface composition by energy dispersive X-ray spectroscopy (EDS), X-ray powder diffraction (XRPD) and Xray photoelectron spectroscopy (XPS), whereas the electrochemical properties were studied by electrochemical impedance spectroscopy (EIS), polarization measurements and cyclic voltammetry (CV). It was shown that the roughness factor of Ni-(Ebonex/Ir) composite coatings calculated relative to the surface area of the pure Ni sample increased with the increasing content of Ebonex/Ir particles in the bath to a maximum value of 40.6. All samples displayed a Tafel slope of about 60 mV dec(-1) in the potential range corresponding to lower current densities for the OER. The increase of the apparent activity for the OER at Ni-(Ebonex/Ir) coatings compared with the pure Ni coating was attributed only to the increase of the electrochemically active surface area. Although the pure Ni coating initially exhibited higher intrinsic catalytic activity for the OER than the composite coatings, it also showed a drastic loss of activity after subjecting to continuous oxygen evolution at j = 50 mA cm(-2) for 24 h (Delta E = 395 mV). At the same time, the OER overpotential at Ni-(Ebonex/Ir) coatings only negligibly increased after the stability test (Delta E = 22 mV). The improved retention of catalytic activity observed with Ni-(Ebonex/Ir) coatings was ascribed to the presence of IrO2 which inhibited the formation of the inactive gamma-NiOOH phase.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - International Journal of Hydrogen Energy
T1  - Ni-(Ebonex-supported Ir) composite coatings as electrocatalysts for alkaline water electrolysis. Part II: Oxygen evolution
EP  - 20514
IS  - 45
SP  - 20502
VL  - 41
DO  - 10.1016/j.ijhydene.2016.08.226
ER  - 

@article{
author = "Jović, Borka M and Lačnjevac, Uroš and Jović, Vladimir D and Gajić-Krstajić, Ljiljana M and Kovač, Janez and Poleti, Dejan and Krstajić, Nedeljko V",
year = "2016",
abstract = "The oxygen evolution reaction (OER) was studied at pure Ni and Ni-(Ebonex/Ir) composite coatings in 1 M NaOH solution at 25 degrees C. Ni-(Ebonex-supported Ir) coatings were electro-deposited from a nickel Watts bath containing different concentrations of suspended Ebonex/Ir particles (0-2 g dm(-3)) onto a Ni 40 mesh substrate. The surface morphology of the coatings was examined by scanning electron microscopy (SEM), the surface composition by energy dispersive X-ray spectroscopy (EDS), X-ray powder diffraction (XRPD) and Xray photoelectron spectroscopy (XPS), whereas the electrochemical properties were studied by electrochemical impedance spectroscopy (EIS), polarization measurements and cyclic voltammetry (CV). It was shown that the roughness factor of Ni-(Ebonex/Ir) composite coatings calculated relative to the surface area of the pure Ni sample increased with the increasing content of Ebonex/Ir particles in the bath to a maximum value of 40.6. All samples displayed a Tafel slope of about 60 mV dec(-1) in the potential range corresponding to lower current densities for the OER. The increase of the apparent activity for the OER at Ni-(Ebonex/Ir) coatings compared with the pure Ni coating was attributed only to the increase of the electrochemically active surface area. Although the pure Ni coating initially exhibited higher intrinsic catalytic activity for the OER than the composite coatings, it also showed a drastic loss of activity after subjecting to continuous oxygen evolution at j = 50 mA cm(-2) for 24 h (Delta E = 395 mV). At the same time, the OER overpotential at Ni-(Ebonex/Ir) coatings only negligibly increased after the stability test (Delta E = 22 mV). The improved retention of catalytic activity observed with Ni-(Ebonex/Ir) coatings was ascribed to the presence of IrO2 which inhibited the formation of the inactive gamma-NiOOH phase.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "International Journal of Hydrogen Energy",
title = "Ni-(Ebonex-supported Ir) composite coatings as electrocatalysts for alkaline water electrolysis. Part II: Oxygen evolution",
pages = "20514-20502",
number = "45",
volume = "41",
doi = "10.1016/j.ijhydene.2016.08.226"
}

Jović, B. M., Lačnjevac, U., Jović, V. D., Gajić-Krstajić, L. M., Kovač, J., Poleti, D.,& Krstajić, N. V.. (2016). Ni-(Ebonex-supported Ir) composite coatings as electrocatalysts for alkaline water electrolysis. Part II: Oxygen evolution. in International Journal of Hydrogen Energy
Pergamon-Elsevier Science Ltd, Oxford., 41(45), 20502-20514.
https://doi.org/10.1016/j.ijhydene.2016.08.226

Jović BM, Lačnjevac U, Jović VD, Gajić-Krstajić LM, Kovač J, Poleti D, Krstajić NV. Ni-(Ebonex-supported Ir) composite coatings as electrocatalysts for alkaline water electrolysis. Part II: Oxygen evolution. in International Journal of Hydrogen Energy. 2016;41(45):20502-20514.
doi:10.1016/j.ijhydene.2016.08.226 .

Jović, Borka M, Lačnjevac, Uroš, Jović, Vladimir D, Gajić-Krstajić, Ljiljana M, Kovač, Janez, Poleti, Dejan, Krstajić, Nedeljko V, "Ni-(Ebonex-supported Ir) composite coatings as electrocatalysts for alkaline water electrolysis. Part II: Oxygen evolution" in International Journal of Hydrogen Energy, 41, no. 45 (2016):20502-20514,
https://doi.org/10.1016/j.ijhydene.2016.08.226 . .

TY  - JOUR
AU  - Gajić-Krstajić, Ljiljana M
AU  - Elezović, Nevenka R.
AU  - Jović, Borka M
AU  - Martelli, Gian N.
AU  - Jović, Vladimir D
AU  - Krstajić, Nedeljko V
PY  - 2016
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/992
AB  - The aim of this study was to gain a better understanding of the feasibility of partial replacement of dichromate, Cr(VI), with phosphate buffer, focusing on the cathode reaction selectivity for hydrogen evolution on mild steel and Fe-Mo cathodes in undivided cell for chlorate production. To evaluate the ability of phosphate and Cr(VI) additions to hinder hypochlorite and chlorate reduction, overall current efficiency (CE) measurements in laboratory cell for chlorate production on stationary electrodes were performed. The concentration of hypochlorite was determined by a conventional potentiometric titration method using 0.01 mol dm(-3) As2O3 solution as a titrant. The chlorate concentration was determined by excess of 1.0 mol dm(-3) As2O3 solution and excess of arsenic oxide was titrated with 0.1 mol dm(-3) KBrO3 solution in a strong acidic solution. Cathodic hypochlorite and chlorate reduction were suppressed efficiently by addition of 3 g dm(-3) dichromate at both cathodes, except that Fe-Mo cathode exhibited higher catalytic activity for hydrogen evolution reaction (HER). The overvoltage for the HER was around 0.17 V lower on Fe-Mo cathode than on mild steel at the current density of 3 kA m(-2). It was found that a dichromate content as low as 0.1 g dm(-3) is sufficient for complete suppression of cathodic hypochlorite and chlorate reduction onto Fe-Mo catalyst in phosphate buffering system (3 g dm(-3) Na2HPO4 + NaH2PO4). The overall current efficiency was practically the same as in the case of the presence of 3 g dm(-3) dichromate buffer (98%). However, for the mild steel cathode, the overall current efficiency for the chlorate production was somewhat lower in the above mentioned mixed phosphate + dichromate buffering system (95%) than in the pure dichromate buffering solution (97.5%).
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska Industrija
T1  - Fe-Mo alloy coatings as cathodes in chlorate production process
EP  - 89
IS  - 1
SP  - 81
VL  - 70
DO  - 10.2298/HEMIND150119014G
ER  - 

@article{
author = "Gajić-Krstajić, Ljiljana M and Elezović, Nevenka R. and Jović, Borka M and Martelli, Gian N. and Jović, Vladimir D and Krstajić, Nedeljko V",
year = "2016",
abstract = "The aim of this study was to gain a better understanding of the feasibility of partial replacement of dichromate, Cr(VI), with phosphate buffer, focusing on the cathode reaction selectivity for hydrogen evolution on mild steel and Fe-Mo cathodes in undivided cell for chlorate production. To evaluate the ability of phosphate and Cr(VI) additions to hinder hypochlorite and chlorate reduction, overall current efficiency (CE) measurements in laboratory cell for chlorate production on stationary electrodes were performed. The concentration of hypochlorite was determined by a conventional potentiometric titration method using 0.01 mol dm(-3) As2O3 solution as a titrant. The chlorate concentration was determined by excess of 1.0 mol dm(-3) As2O3 solution and excess of arsenic oxide was titrated with 0.1 mol dm(-3) KBrO3 solution in a strong acidic solution. Cathodic hypochlorite and chlorate reduction were suppressed efficiently by addition of 3 g dm(-3) dichromate at both cathodes, except that Fe-Mo cathode exhibited higher catalytic activity for hydrogen evolution reaction (HER). The overvoltage for the HER was around 0.17 V lower on Fe-Mo cathode than on mild steel at the current density of 3 kA m(-2). It was found that a dichromate content as low as 0.1 g dm(-3) is sufficient for complete suppression of cathodic hypochlorite and chlorate reduction onto Fe-Mo catalyst in phosphate buffering system (3 g dm(-3) Na2HPO4 + NaH2PO4). The overall current efficiency was practically the same as in the case of the presence of 3 g dm(-3) dichromate buffer (98%). However, for the mild steel cathode, the overall current efficiency for the chlorate production was somewhat lower in the above mentioned mixed phosphate + dichromate buffering system (95%) than in the pure dichromate buffering solution (97.5%).",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska Industrija",
title = "Fe-Mo alloy coatings as cathodes in chlorate production process",
pages = "89-81",
number = "1",
volume = "70",
doi = "10.2298/HEMIND150119014G"
}

Gajić-Krstajić, L. M., Elezović, N. R., Jović, B. M., Martelli, G. N., Jović, V. D.,& Krstajić, N. V.. (2016). Fe-Mo alloy coatings as cathodes in chlorate production process. in Hemijska Industrija
Savez hemijskih inženjera, Beograd., 70(1), 81-89.
https://doi.org/10.2298/HEMIND150119014G

Gajić-Krstajić LM, Elezović NR, Jović BM, Martelli GN, Jović VD, Krstajić NV. Fe-Mo alloy coatings as cathodes in chlorate production process. in Hemijska Industrija. 2016;70(1):81-89.
doi:10.2298/HEMIND150119014G .

Gajić-Krstajić, Ljiljana M, Elezović, Nevenka R., Jović, Borka M, Martelli, Gian N., Jović, Vladimir D, Krstajić, Nedeljko V, "Fe-Mo alloy coatings as cathodes in chlorate production process" in Hemijska Industrija, 70, no. 1 (2016):81-89,
https://doi.org/10.2298/HEMIND150119014G . .

TY  - JOUR
AU  - Elezović, Nevenka R.
AU  - Radmilović, Velimir R
AU  - Kovač, Janez
AU  - Babić, Biljana M.
AU  - Gajić-Krstajić, Ljiljana M
AU  - Krstajić, Nedeljko V
PY  - 2015
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/918
AB  - A platinum nanocatalyst on Sb doped tin oxide support (Sb-SnO2) was synthesized and characterized as a catalyst for oxygen reduction reaction in 0.1 mol dm(-3) NaOH solution at 25 degrees C. Sb (5%) doped tin oxide support was synthesized by a modified hydrazine reduction procedure. The platinum nanocatalyst (20% Pt) on Sb-SnO2 support was synthesized by a borohydride reduction method. The synthesized support and catalyst were characterized by high resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS) and X-ray diffraction technique (XRD). X-ray photoelectron spectroscopy was applied to characterize the chemical status of elements before and after Pt-treatment. XPS spectra of Sn 3d, Pt 4f, Sb 3d and O 1s revealed that the Pt-deposition on Sb-SnO2 support induced the reduction of the Sn(4+) oxidation state to Sn(2+) and Sn(0) states, while Pt remained in the metallic state and Sb was in the (3+) oxidation state. Homogenous Pt nanoparticle distribution over the support, without pronounced particle agglomeration, was confirmed by HRTEM technique. The average Pt particle size was 2.9 nm. The electrochemically active Pt surface area of the catalyst was determined by the integration of the cyclic voltammetry curve in the potential region of underpotential deposition of hydrogen, after double layer charge correction, taking into account the reference value of 210 mu C cm(-2) for full monolayer coverage. This calculation gave the value of 51 m(2) g(-1). The kinetics of the oxygen reduction reaction with Pt/[Sb-SnO2 catalyst was studied by cyclic voltammetry and linear sweep voltammetry using a rotating gold disc electrode. Two different Tafel slopes were observed: one close to 60 mV dec(-1) in the low current density region, and another at similar to 120 mV dec(-1) in the higher current densities region, as was already referred in previous reports for the oxygen reduction reaction with polycrystalline Pt, as well as with different Pt based nanocatalysts. The specific activities for oxygen reduction, expressed in terms of kinetic current densities per electrochemically Pt active surface area, as well as per mass of Pt loaded, at the constant potential of practical interest (0.85 V and 0.90 V vs. RHE), were compared to a carbon supported (Vulcan XC-72) catalyst. The Pt/[Sb-SnO2 catalyst exhibited similar catalytic activity for oxygen reduction reaction like carbon supported one. The advantages of the carbon free support application in terms of the durability and stability of the catalysts were proved by accelerated stability tests.
PB  - Royal Soc Chemistry, Cambridge
T2  - RSC Advances
T1  - Pt nanoparticles on tin oxide based support as a beneficial catalyst for oxygen reduction in alkaline solutions
EP  - 15929
IS  - 21
SP  - 15923
VL  - 5
DO  - 10.1039/c4ra13391a
ER  - 

@article{
author = "Elezović, Nevenka R. and Radmilović, Velimir R and Kovač, Janez and Babić, Biljana M. and Gajić-Krstajić, Ljiljana M and Krstajić, Nedeljko V",
year = "2015",
abstract = "A platinum nanocatalyst on Sb doped tin oxide support (Sb-SnO2) was synthesized and characterized as a catalyst for oxygen reduction reaction in 0.1 mol dm(-3) NaOH solution at 25 degrees C. Sb (5%) doped tin oxide support was synthesized by a modified hydrazine reduction procedure. The platinum nanocatalyst (20% Pt) on Sb-SnO2 support was synthesized by a borohydride reduction method. The synthesized support and catalyst were characterized by high resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS) and X-ray diffraction technique (XRD). X-ray photoelectron spectroscopy was applied to characterize the chemical status of elements before and after Pt-treatment. XPS spectra of Sn 3d, Pt 4f, Sb 3d and O 1s revealed that the Pt-deposition on Sb-SnO2 support induced the reduction of the Sn(4+) oxidation state to Sn(2+) and Sn(0) states, while Pt remained in the metallic state and Sb was in the (3+) oxidation state. Homogenous Pt nanoparticle distribution over the support, without pronounced particle agglomeration, was confirmed by HRTEM technique. The average Pt particle size was 2.9 nm. The electrochemically active Pt surface area of the catalyst was determined by the integration of the cyclic voltammetry curve in the potential region of underpotential deposition of hydrogen, after double layer charge correction, taking into account the reference value of 210 mu C cm(-2) for full monolayer coverage. This calculation gave the value of 51 m(2) g(-1). The kinetics of the oxygen reduction reaction with Pt/[Sb-SnO2 catalyst was studied by cyclic voltammetry and linear sweep voltammetry using a rotating gold disc electrode. Two different Tafel slopes were observed: one close to 60 mV dec(-1) in the low current density region, and another at similar to 120 mV dec(-1) in the higher current densities region, as was already referred in previous reports for the oxygen reduction reaction with polycrystalline Pt, as well as with different Pt based nanocatalysts. The specific activities for oxygen reduction, expressed in terms of kinetic current densities per electrochemically Pt active surface area, as well as per mass of Pt loaded, at the constant potential of practical interest (0.85 V and 0.90 V vs. RHE), were compared to a carbon supported (Vulcan XC-72) catalyst. The Pt/[Sb-SnO2 catalyst exhibited similar catalytic activity for oxygen reduction reaction like carbon supported one. The advantages of the carbon free support application in terms of the durability and stability of the catalysts were proved by accelerated stability tests.",
publisher = "Royal Soc Chemistry, Cambridge",
journal = "RSC Advances",
title = "Pt nanoparticles on tin oxide based support as a beneficial catalyst for oxygen reduction in alkaline solutions",
pages = "15929-15923",
number = "21",
volume = "5",
doi = "10.1039/c4ra13391a"
}

Elezović, N. R., Radmilović, V. R., Kovač, J., Babić, B. M., Gajić-Krstajić, L. M.,& Krstajić, N. V.. (2015). Pt nanoparticles on tin oxide based support as a beneficial catalyst for oxygen reduction in alkaline solutions. in RSC Advances
Royal Soc Chemistry, Cambridge., 5(21), 15923-15929.
https://doi.org/10.1039/c4ra13391a

Elezović NR, Radmilović VR, Kovač J, Babić BM, Gajić-Krstajić LM, Krstajić NV. Pt nanoparticles on tin oxide based support as a beneficial catalyst for oxygen reduction in alkaline solutions. in RSC Advances. 2015;5(21):15923-15929.
doi:10.1039/c4ra13391a .

Elezović, Nevenka R., Radmilović, Velimir R, Kovač, Janez, Babić, Biljana M., Gajić-Krstajić, Ljiljana M, Krstajić, Nedeljko V, "Pt nanoparticles on tin oxide based support as a beneficial catalyst for oxygen reduction in alkaline solutions" in RSC Advances, 5, no. 21 (2015):15923-15929,
https://doi.org/10.1039/c4ra13391a . .

TY  - JOUR
AU  - Jović, Borka M
AU  - Jović, Vladimir D
AU  - Lačnjevac, Uroš
AU  - Gajić-Krstajić, Ljiljana M
AU  - Krstajić, Nedeljko V
PY  - 2015
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/866
AB  - The hydrogen evolution reaction (HER) was studied at electrodeposited Ni and Ni-(Ebonex/Ir) composite coatings in 1 mol dm(-3) NaOH solution at 25 degrees C. The Ni-(Ebonex/Ir) coatings were electrodeposited from a nickel Watts type bath containing different amounts of suspended Ebonex/Ir(30 wt.%) powder particles (0-2 g dm(-3)) onto a Ni 40 mesh substrate. The electrodes were investigated by cyclic voltammetry (CV), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), electrochemical impedance spectroscopy (EIS) and polarization measurements. It was shown that the roughness factor of coatings increased to a maximum value of 27 with increasing the concentration of Ebonex/Ir particles in the deposition bath, while that of a pure Ni coating was found to be 3.2. In the whole potential range of the HER only one Tafel slope of about -120 mV dec(-1) was observed at all polarization curves. Considerably improved intrinsic catalytic activity for the HER compared to pure Ni was achieved with the composite coating deposited from the bath with the lowest concentration of Ebonex/Ir particles (0.1 g dm(-3)). Further enhancement of the apparent catalytic activity for the HER of Ni-(Ebonex/Ir) composite coatings obtained at higher concentrations of suspended Ebonex/Ir particles in the bath was attributed only to the increase of their electrochemically active surface area.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - International Journal of Hydrogen Energy
T1  - Ni-(Ebonex-supported Ir) composite coatings as electrocatalysts for alkaline water electrolysis. Part I: Hydrogen evolution
EP  - 10490
IS  - 33
SP  - 10480
VL  - 40
DO  - 10.1016/j.ijhydene.2015.06.127
ER  - 

@article{
author = "Jović, Borka M and Jović, Vladimir D and Lačnjevac, Uroš and Gajić-Krstajić, Ljiljana M and Krstajić, Nedeljko V",
year = "2015",
abstract = "The hydrogen evolution reaction (HER) was studied at electrodeposited Ni and Ni-(Ebonex/Ir) composite coatings in 1 mol dm(-3) NaOH solution at 25 degrees C. The Ni-(Ebonex/Ir) coatings were electrodeposited from a nickel Watts type bath containing different amounts of suspended Ebonex/Ir(30 wt.%) powder particles (0-2 g dm(-3)) onto a Ni 40 mesh substrate. The electrodes were investigated by cyclic voltammetry (CV), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), electrochemical impedance spectroscopy (EIS) and polarization measurements. It was shown that the roughness factor of coatings increased to a maximum value of 27 with increasing the concentration of Ebonex/Ir particles in the deposition bath, while that of a pure Ni coating was found to be 3.2. In the whole potential range of the HER only one Tafel slope of about -120 mV dec(-1) was observed at all polarization curves. Considerably improved intrinsic catalytic activity for the HER compared to pure Ni was achieved with the composite coating deposited from the bath with the lowest concentration of Ebonex/Ir particles (0.1 g dm(-3)). Further enhancement of the apparent catalytic activity for the HER of Ni-(Ebonex/Ir) composite coatings obtained at higher concentrations of suspended Ebonex/Ir particles in the bath was attributed only to the increase of their electrochemically active surface area.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "International Journal of Hydrogen Energy",
title = "Ni-(Ebonex-supported Ir) composite coatings as electrocatalysts for alkaline water electrolysis. Part I: Hydrogen evolution",
pages = "10490-10480",
number = "33",
volume = "40",
doi = "10.1016/j.ijhydene.2015.06.127"
}

Jović, B. M., Jović, V. D., Lačnjevac, U., Gajić-Krstajić, L. M.,& Krstajić, N. V.. (2015). Ni-(Ebonex-supported Ir) composite coatings as electrocatalysts for alkaline water electrolysis. Part I: Hydrogen evolution. in International Journal of Hydrogen Energy
Pergamon-Elsevier Science Ltd, Oxford., 40(33), 10480-10490.
https://doi.org/10.1016/j.ijhydene.2015.06.127

Jović BM, Jović VD, Lačnjevac U, Gajić-Krstajić LM, Krstajić NV. Ni-(Ebonex-supported Ir) composite coatings as electrocatalysts for alkaline water electrolysis. Part I: Hydrogen evolution. in International Journal of Hydrogen Energy. 2015;40(33):10480-10490.
doi:10.1016/j.ijhydene.2015.06.127 .

Jović, Borka M, Jović, Vladimir D, Lačnjevac, Uroš, Gajić-Krstajić, Ljiljana M, Krstajić, Nedeljko V, "Ni-(Ebonex-supported Ir) composite coatings as electrocatalysts for alkaline water electrolysis. Part I: Hydrogen evolution" in International Journal of Hydrogen Energy, 40, no. 33 (2015):10480-10490,
https://doi.org/10.1016/j.ijhydene.2015.06.127 . .

TY  - JOUR
AU  - Lačnjevac, Uroš
AU  - Jović, Borka M
AU  - Gajić-Krstajić, Ljiljana M
AU  - Kovač, Janez
AU  - Jović, Vladimir D
AU  - Krstajić, Nedeljko V
PY  - 2013
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/669
AB  - The aim of this work was to investigate the possibility of preparation of the composite Cr-MoO2 coatings onto steel and titanium substrates as cathode materials with high selective properties which imply the suppression of hypochlorite reduction as a side reaction during hypochlorite commercial production. The electrodes were prepared by simultaneous deposition of chromium and suspended MoO2 particles on titanium substrate from acid chromium (VI) bath. The current efficiency for electrodeposition of the composite coatings did not vary significantly with the concentration of suspended MoO2 particles. The content of molybdenum in the deposits was relatively low (0.2-1.5 at.%) and increased with increasing the concentration of suspended MoO2 particles in the bath, in the range from 0 to 10 g dm(-3). With further increase in the concentration of MoO2, the content of molybdenum in the coating varied insignificantly. X-ray photoelectron spectroscopy-XPS and EDS analysis were applied to analyze elemental composition and chemical bonding of elements on the surface and in the sub-surface region of obtained coatings. When the concentration of MoO2 particles in the bath was raised above 5 g dm(-3), the appearance of the coating changed from the typical pure chromium deposit to needle-like deposit with the appearance of black inclusions on the surface. XPS analysis and corresponding Cr 2p spectra showed the presence of chromium oxide, probably Cr2O3 with Cr(3+) valence state on the surface and in the sub-surface region of Cr-MoO2 coatings. Investigation of the current efficiency for the hydrogen evolution reaction (HER) on Cr-MoO2 cathodes showed that it increased with the increase of the content of MoO2 particles in the coating, exceeding the value of 97% in the solution with the hypochlorite concentration of 0.21 mol dm(-3). Under the same conditions, the current efficiency for the HER on Ti and Ti/Cr cathodes is very low (approximate to 20%), and corresponding polarization curves confirmed the fact that the side reaction of hypochlorite reduction takes place in the diffusion-controlled regime on these electrodes. The high selectivity of Cr-MoO2 coating is probably caused by the presence of chromium oxide (hydroxide) formed at the surface of the coating during co-deposition of Cr and MoO2 particles, which prevents hypochlorite reduction on the cathode during the HER.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Electrochimica Acta
T1  - Ti substrate coated with composite Cr-MoO2 coatings as highly selective cathode materials in hypochlorite production
EP  - 42
SP  - 34
VL  - 96
DO  - 10.1016/j.electacta.2013.02.086
ER  - 

@article{
author = "Lačnjevac, Uroš and Jović, Borka M and Gajić-Krstajić, Ljiljana M and Kovač, Janez and Jović, Vladimir D and Krstajić, Nedeljko V",
year = "2013",
abstract = "The aim of this work was to investigate the possibility of preparation of the composite Cr-MoO2 coatings onto steel and titanium substrates as cathode materials with high selective properties which imply the suppression of hypochlorite reduction as a side reaction during hypochlorite commercial production. The electrodes were prepared by simultaneous deposition of chromium and suspended MoO2 particles on titanium substrate from acid chromium (VI) bath. The current efficiency for electrodeposition of the composite coatings did not vary significantly with the concentration of suspended MoO2 particles. The content of molybdenum in the deposits was relatively low (0.2-1.5 at.%) and increased with increasing the concentration of suspended MoO2 particles in the bath, in the range from 0 to 10 g dm(-3). With further increase in the concentration of MoO2, the content of molybdenum in the coating varied insignificantly. X-ray photoelectron spectroscopy-XPS and EDS analysis were applied to analyze elemental composition and chemical bonding of elements on the surface and in the sub-surface region of obtained coatings. When the concentration of MoO2 particles in the bath was raised above 5 g dm(-3), the appearance of the coating changed from the typical pure chromium deposit to needle-like deposit with the appearance of black inclusions on the surface. XPS analysis and corresponding Cr 2p spectra showed the presence of chromium oxide, probably Cr2O3 with Cr(3+) valence state on the surface and in the sub-surface region of Cr-MoO2 coatings. Investigation of the current efficiency for the hydrogen evolution reaction (HER) on Cr-MoO2 cathodes showed that it increased with the increase of the content of MoO2 particles in the coating, exceeding the value of 97% in the solution with the hypochlorite concentration of 0.21 mol dm(-3). Under the same conditions, the current efficiency for the HER on Ti and Ti/Cr cathodes is very low (approximate to 20%), and corresponding polarization curves confirmed the fact that the side reaction of hypochlorite reduction takes place in the diffusion-controlled regime on these electrodes. The high selectivity of Cr-MoO2 coating is probably caused by the presence of chromium oxide (hydroxide) formed at the surface of the coating during co-deposition of Cr and MoO2 particles, which prevents hypochlorite reduction on the cathode during the HER.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Electrochimica Acta",
title = "Ti substrate coated with composite Cr-MoO2 coatings as highly selective cathode materials in hypochlorite production",
pages = "42-34",
volume = "96",
doi = "10.1016/j.electacta.2013.02.086"
}

Lačnjevac, U., Jović, B. M., Gajić-Krstajić, L. M., Kovač, J., Jović, V. D.,& Krstajić, N. V.. (2013). Ti substrate coated with composite Cr-MoO2 coatings as highly selective cathode materials in hypochlorite production. in Electrochimica Acta
Pergamon-Elsevier Science Ltd, Oxford., 96, 34-42.
https://doi.org/10.1016/j.electacta.2013.02.086

Lačnjevac U, Jović BM, Gajić-Krstajić LM, Kovač J, Jović VD, Krstajić NV. Ti substrate coated with composite Cr-MoO2 coatings as highly selective cathode materials in hypochlorite production. in Electrochimica Acta. 2013;96:34-42.
doi:10.1016/j.electacta.2013.02.086 .

Lačnjevac, Uroš, Jović, Borka M, Gajić-Krstajić, Ljiljana M, Kovač, Janez, Jović, Vladimir D, Krstajić, Nedeljko V, "Ti substrate coated with composite Cr-MoO2 coatings as highly selective cathode materials in hypochlorite production" in Electrochimica Acta, 96 (2013):34-42,
https://doi.org/10.1016/j.electacta.2013.02.086 . .

TY  - JOUR
AU  - Jović, Vladimir D
AU  - Lačnjevac, Uroš
AU  - Jović, Borka M
AU  - Gajić-Krstajić, Ljiljana M
AU  - Krstajić, Nedeljko V
PY  - 2013
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/631
AB  - In this work, the effect of aging of the electrolyte in the electrodeposition of Ni MoO2 composite coatings on their morphology (scanning electron microscopy), chemical composition (energy-dispersive X-ray spectroscopy), polarization characteristics and "service life", tested for the hydrogen evolution reaction (HER) in 32 mass % NaOH at 90 degrees C, was investigated. Polarization characteristics and results of the "service life" test of Ni MoO2 composite coatings obtained after different aging periods of the electrolyte for deposition (suspension of MoO2 powder particles in a solution containing 2 M NH4Cl + + 0.2 M NiCl2) were compared with that recorded for the commercial De Nora's Ni+RuO2 cathode coating (DN). It was shown that aging of the electrolyte did not influence the morphology and chemical composition of Ni MoO2 composite coatings electrodeposited under conditions simulating their industrial production, while the polarization characteristics for the HER were influenced. The best coating, obtained after 180 days of electrolyte aging, showed a completely different (layered) structure of the deposit and significantly better performance than the commercial DN electrode during the "service life" test.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - Ni-MoO2 composite cathodes for hydrogen evolution in alkaline solution. Effect of aging of the electrolyte for their electrodeposition
EP  - 700
IS  - 5
SP  - 689
VL  - 78
DO  - 10.2298/JSC120831112J
ER  - 

@article{
author = "Jović, Vladimir D and Lačnjevac, Uroš and Jović, Borka M and Gajić-Krstajić, Ljiljana M and Krstajić, Nedeljko V",
year = "2013",
abstract = "In this work, the effect of aging of the electrolyte in the electrodeposition of Ni MoO2 composite coatings on their morphology (scanning electron microscopy), chemical composition (energy-dispersive X-ray spectroscopy), polarization characteristics and "service life", tested for the hydrogen evolution reaction (HER) in 32 mass % NaOH at 90 degrees C, was investigated. Polarization characteristics and results of the "service life" test of Ni MoO2 composite coatings obtained after different aging periods of the electrolyte for deposition (suspension of MoO2 powder particles in a solution containing 2 M NH4Cl + + 0.2 M NiCl2) were compared with that recorded for the commercial De Nora's Ni+RuO2 cathode coating (DN). It was shown that aging of the electrolyte did not influence the morphology and chemical composition of Ni MoO2 composite coatings electrodeposited under conditions simulating their industrial production, while the polarization characteristics for the HER were influenced. The best coating, obtained after 180 days of electrolyte aging, showed a completely different (layered) structure of the deposit and significantly better performance than the commercial DN electrode during the "service life" test.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "Ni-MoO2 composite cathodes for hydrogen evolution in alkaline solution. Effect of aging of the electrolyte for their electrodeposition",
pages = "700-689",
number = "5",
volume = "78",
doi = "10.2298/JSC120831112J"
}

Jović, V. D., Lačnjevac, U., Jović, B. M., Gajić-Krstajić, L. M.,& Krstajić, N. V.. (2013). Ni-MoO2 composite cathodes for hydrogen evolution in alkaline solution. Effect of aging of the electrolyte for their electrodeposition. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 78(5), 689-700.
https://doi.org/10.2298/JSC120831112J

Jović VD, Lačnjevac U, Jović BM, Gajić-Krstajić LM, Krstajić NV. Ni-MoO2 composite cathodes for hydrogen evolution in alkaline solution. Effect of aging of the electrolyte for their electrodeposition. in Journal of the Serbian Chemical Society. 2013;78(5):689-700.
doi:10.2298/JSC120831112J .

Jović, Vladimir D, Lačnjevac, Uroš, Jović, Borka M, Gajić-Krstajić, Ljiljana M, Krstajić, Nedeljko V, "Ni-MoO2 composite cathodes for hydrogen evolution in alkaline solution. Effect of aging of the electrolyte for their electrodeposition" in Journal of the Serbian Chemical Society, 78, no. 5 (2013):689-700,
https://doi.org/10.2298/JSC120831112J . .

TY  - JOUR
AU  - Jović, Borka M
AU  - Lačnjevac, Uroš
AU  - Jović, Vladimir D
AU  - Gajić-Krstajić, Ljiljana M
AU  - Krstajić, Nedeljko V
PY  - 2012
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/607
AB  - MoO3 particles were co-deposited with Ni onto smooth or rough Ni supports from modified Watt baths of different compositions. Morphology and composition of the electrodeposits were characterized by means of cyclic voltammetry, X-ray diffraction analysis, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray spectroscopy. The electrocatalytic activity of the composite catalysts for H-2 evolution in alkaline solutions was determined by quasi-stationary polarization curves. Activity increases with MoOx content in the Ni deposit up to a limiting value. The composite Ni-MoOx catalysts exhibited high catalytic activity, similar to that of a commercial Ni-RuO2 catalyst. Stability tests showed that the Ni-MoOx co-deposits were stable under constant current conditions and exhibited excellent tolerance to repeated short-circuiting.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - On the kinetics of the hydrogen evolution reaction on Ni-MoOx composite catalysts in alkaline solutions
EP  - 224
IS  - 2
SP  - 211
VL  - 77
DO  - 10.2298/JSC110621185J
ER  - 

@article{
author = "Jović, Borka M and Lačnjevac, Uroš and Jović, Vladimir D and Gajić-Krstajić, Ljiljana M and Krstajić, Nedeljko V",
year = "2012",
abstract = "MoO3 particles were co-deposited with Ni onto smooth or rough Ni supports from modified Watt baths of different compositions. Morphology and composition of the electrodeposits were characterized by means of cyclic voltammetry, X-ray diffraction analysis, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray spectroscopy. The electrocatalytic activity of the composite catalysts for H-2 evolution in alkaline solutions was determined by quasi-stationary polarization curves. Activity increases with MoOx content in the Ni deposit up to a limiting value. The composite Ni-MoOx catalysts exhibited high catalytic activity, similar to that of a commercial Ni-RuO2 catalyst. Stability tests showed that the Ni-MoOx co-deposits were stable under constant current conditions and exhibited excellent tolerance to repeated short-circuiting.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "On the kinetics of the hydrogen evolution reaction on Ni-MoOx composite catalysts in alkaline solutions",
pages = "224-211",
number = "2",
volume = "77",
doi = "10.2298/JSC110621185J"
}

Jović, B. M., Lačnjevac, U., Jović, V. D., Gajić-Krstajić, L. M.,& Krstajić, N. V.. (2012). On the kinetics of the hydrogen evolution reaction on Ni-MoOx composite catalysts in alkaline solutions. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 77(2), 211-224.
https://doi.org/10.2298/JSC110621185J

Jović BM, Lačnjevac U, Jović VD, Gajić-Krstajić LM, Krstajić NV. On the kinetics of the hydrogen evolution reaction on Ni-MoOx composite catalysts in alkaline solutions. in Journal of the Serbian Chemical Society. 2012;77(2):211-224.
doi:10.2298/JSC110621185J .

Jović, Borka M, Lačnjevac, Uroš, Jović, Vladimir D, Gajić-Krstajić, Ljiljana M, Krstajić, Nedeljko V, "On the kinetics of the hydrogen evolution reaction on Ni-MoOx composite catalysts in alkaline solutions" in Journal of the Serbian Chemical Society, 77, no. 2 (2012):211-224,
https://doi.org/10.2298/JSC110621185J . .

TY  - JOUR
AU  - Elezović, Nevenka R.
AU  - Babić, Biljana M.
AU  - Gajić-Krstajić, Ljiljana M
AU  - Ercius, P
AU  - Radmilović, Velimir R
AU  - Krstajić, Nedeljko V
AU  - Vračar, Ljiljana M
PY  - 2012
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/570
AB  - Platinum nanocatalyst at nano-tungsten carbide was synthesized, characterized and tested for oxygen reduction reaction (ORR) in 0.1 mol dm(-3) NaOH, at 25 degrees C. Tungsten-carbide islands on nano-tungsten particles (WC) was synthesized from gel prepared by using nanoparticles of WO3, previously produced from W-powder oxidized in H2O2. The support was porous material with high specific surface area (177 m(2)g(-1)). The WC supported Pt (10 wt.%) catalyst was prepared by borohydride reduction method. X-ray diffraction of the catalyst demonstrates successful reduction of Pt precursor to metallic form. STEM analysis of Pt/WC catalyst showed the existence of Pt particles lower than 2 nm in size, even the clusters of Pt atoms. Electrochemically active surface area of Pt was determined from adsorption/desorption charge of hydrogen atoms. Catalytic activity of the synthesized catalyst for ORR was studied by cyclic voltammetry and linear sweep voltammetry at rotating disk electrode. The onset potential on Pt/WC for ORR, comparing with Pt/Vulcan, was shifted to the positive potentials for about 150 mV. Pt/WC catalyst shows one Tafel slope of -0.105 V dec(-1), remarkable catalytic activity expressed either through the value of the current density per real surface area, or through the mass activity and excellent stability.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Electrochimica Acta
T1  - Pt supported on nano-tungsten carbide as a beneficial catalyst for the oxygen reduction reaction in alkaline solution
EP  - 246
SP  - 239
VL  - 69
DO  - 10.1016/j.electacta.2012.02.105
ER  - 

@article{
author = "Elezović, Nevenka R. and Babić, Biljana M. and Gajić-Krstajić, Ljiljana M and Ercius, P and Radmilović, Velimir R and Krstajić, Nedeljko V and Vračar, Ljiljana M",
year = "2012",
abstract = "Platinum nanocatalyst at nano-tungsten carbide was synthesized, characterized and tested for oxygen reduction reaction (ORR) in 0.1 mol dm(-3) NaOH, at 25 degrees C. Tungsten-carbide islands on nano-tungsten particles (WC) was synthesized from gel prepared by using nanoparticles of WO3, previously produced from W-powder oxidized in H2O2. The support was porous material with high specific surface area (177 m(2)g(-1)). The WC supported Pt (10 wt.%) catalyst was prepared by borohydride reduction method. X-ray diffraction of the catalyst demonstrates successful reduction of Pt precursor to metallic form. STEM analysis of Pt/WC catalyst showed the existence of Pt particles lower than 2 nm in size, even the clusters of Pt atoms. Electrochemically active surface area of Pt was determined from adsorption/desorption charge of hydrogen atoms. Catalytic activity of the synthesized catalyst for ORR was studied by cyclic voltammetry and linear sweep voltammetry at rotating disk electrode. The onset potential on Pt/WC for ORR, comparing with Pt/Vulcan, was shifted to the positive potentials for about 150 mV. Pt/WC catalyst shows one Tafel slope of -0.105 V dec(-1), remarkable catalytic activity expressed either through the value of the current density per real surface area, or through the mass activity and excellent stability.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Electrochimica Acta",
title = "Pt supported on nano-tungsten carbide as a beneficial catalyst for the oxygen reduction reaction in alkaline solution",
pages = "246-239",
volume = "69",
doi = "10.1016/j.electacta.2012.02.105"
}

Elezović, N. R., Babić, B. M., Gajić-Krstajić, L. M., Ercius, P., Radmilović, V. R., Krstajić, N. V.,& Vračar, L. M.. (2012). Pt supported on nano-tungsten carbide as a beneficial catalyst for the oxygen reduction reaction in alkaline solution. in Electrochimica Acta
Pergamon-Elsevier Science Ltd, Oxford., 69, 239-246.
https://doi.org/10.1016/j.electacta.2012.02.105

Elezović NR, Babić BM, Gajić-Krstajić LM, Ercius P, Radmilović VR, Krstajić NV, Vračar LM. Pt supported on nano-tungsten carbide as a beneficial catalyst for the oxygen reduction reaction in alkaline solution. in Electrochimica Acta. 2012;69:239-246.
doi:10.1016/j.electacta.2012.02.105 .

Elezović, Nevenka R., Babić, Biljana M., Gajić-Krstajić, Ljiljana M, Ercius, P, Radmilović, Velimir R, Krstajić, Nedeljko V, Vračar, Ljiljana M, "Pt supported on nano-tungsten carbide as a beneficial catalyst for the oxygen reduction reaction in alkaline solution" in Electrochimica Acta, 69 (2012):239-246,
https://doi.org/10.1016/j.electacta.2012.02.105 . .

TY  - JOUR
AU  - Krstajić, Nedeljko V
AU  - Gajić-Krstajić, Ljiljana M
AU  - Lačnjevac, Uroš
AU  - Jović, Borka M
AU  - Mora, S
AU  - Jović, Vladimir D
PY  - 2011
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/442
AB  - In this work the Ni-MoOx coatings have been prepared and characterized in view of their possible application as electrocatalysts for hydrogen evolution reaction (HER) in alkaline solution. The procedure of deposition of Ni-MoO3 coatings from the Watt's type bath containing MoO3 powder particles onto Ni mesh, under the conditions of simulated industrial deposition conditions for commercial cathodes, has been presented. The morphology of the obtained coatings was investigated by SEM, the composition by EDS and the phase composition by XRD techniques. The polarization characteristics for hydrogen evolution on the obtained Ni-MoO3 coatings were investigated in the 32 wt.% NaOH at 90 degrees C and compared with the one recorded for the commercial De Nora's coating (DN). It was shown that the best Ni-MoOx coating exhibits almost identical polarization characteristics as the commercial one. By the cross section and XRD analysis of deposited samples it was confirmed that MoO3 powder particles were not occluded by the Ni deposit and that molybdenum species were deposited from the molybdate ions formed by dissolution of MoO3, following the mechanism of induced co-deposition. The reaction mechanism for MoO3 phase deposition has also been proposed.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - International Journal of Hydrogen Energy
T1  - Non-noble metal composite cathodes for hydrogen evolution. Part I: The Ni-MoOx coatings electrodeposited from Watt's type bath containing MoO3 powder particles
EP  - 6449
IS  - 11
SP  - 6441
VL  - 36
DO  - 10.1016/j.ijhydene.2011.02.105
ER  - 

@article{
author = "Krstajić, Nedeljko V and Gajić-Krstajić, Ljiljana M and Lačnjevac, Uroš and Jović, Borka M and Mora, S and Jović, Vladimir D",
year = "2011",
abstract = "In this work the Ni-MoOx coatings have been prepared and characterized in view of their possible application as electrocatalysts for hydrogen evolution reaction (HER) in alkaline solution. The procedure of deposition of Ni-MoO3 coatings from the Watt's type bath containing MoO3 powder particles onto Ni mesh, under the conditions of simulated industrial deposition conditions for commercial cathodes, has been presented. The morphology of the obtained coatings was investigated by SEM, the composition by EDS and the phase composition by XRD techniques. The polarization characteristics for hydrogen evolution on the obtained Ni-MoO3 coatings were investigated in the 32 wt.% NaOH at 90 degrees C and compared with the one recorded for the commercial De Nora's coating (DN). It was shown that the best Ni-MoOx coating exhibits almost identical polarization characteristics as the commercial one. By the cross section and XRD analysis of deposited samples it was confirmed that MoO3 powder particles were not occluded by the Ni deposit and that molybdenum species were deposited from the molybdate ions formed by dissolution of MoO3, following the mechanism of induced co-deposition. The reaction mechanism for MoO3 phase deposition has also been proposed.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "International Journal of Hydrogen Energy",
title = "Non-noble metal composite cathodes for hydrogen evolution. Part I: The Ni-MoOx coatings electrodeposited from Watt's type bath containing MoO3 powder particles",
pages = "6449-6441",
number = "11",
volume = "36",
doi = "10.1016/j.ijhydene.2011.02.105"
}

Krstajić, N. V., Gajić-Krstajić, L. M., Lačnjevac, U., Jović, B. M., Mora, S.,& Jović, V. D.. (2011). Non-noble metal composite cathodes for hydrogen evolution. Part I: The Ni-MoOx coatings electrodeposited from Watt's type bath containing MoO3 powder particles. in International Journal of Hydrogen Energy
Pergamon-Elsevier Science Ltd, Oxford., 36(11), 6441-6449.
https://doi.org/10.1016/j.ijhydene.2011.02.105

Krstajić NV, Gajić-Krstajić LM, Lačnjevac U, Jović BM, Mora S, Jović VD. Non-noble metal composite cathodes for hydrogen evolution. Part I: The Ni-MoOx coatings electrodeposited from Watt's type bath containing MoO3 powder particles. in International Journal of Hydrogen Energy. 2011;36(11):6441-6449.
doi:10.1016/j.ijhydene.2011.02.105 .

Krstajić, Nedeljko V, Gajić-Krstajić, Ljiljana M, Lačnjevac, Uroš, Jović, Borka M, Mora, S, Jović, Vladimir D, "Non-noble metal composite cathodes for hydrogen evolution. Part I: The Ni-MoOx coatings electrodeposited from Watt's type bath containing MoO3 powder particles" in International Journal of Hydrogen Energy, 36, no. 11 (2011):6441-6449,
https://doi.org/10.1016/j.ijhydene.2011.02.105 . .

TY  - JOUR
AU  - Elezović, Nevenka R.
AU  - Babić, Biljana M.
AU  - Radmilović, Velimir R
AU  - Gajić-Krstajić, Ljiljana M
AU  - Krstajić, Nedeljko V
AU  - Vračar, Ljiljana M
PY  - 2011
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/478
AB  - The kinetics of the hydrogen oxidation reaction (HOR) was studied at Pt nanoparticles supported on niobia-doped titania (Pt/N-T). The catalyst support, with the composition of 0.05NbO(2.5-delta)-0.995TiO(2) (0  lt  delta  lt  1), was synthesized by a modified sol gel procedure and characterized by the BET and X-ray diffraction (XRD) techniques. The specific surface area of the support was found to be 70 m(2) g(-1). The XRD analysis revealed the presence of the anatase TiO(2) phase in the support powder. No peaks indicating the existence of Nb-compounds were detected. Pt/N-T nanocatalyst was synthesized by the borohydride reduction method. Transmission electron microscopy revealed a quite homogenous distribution of the Pt nanoparticles over the support, with a mean particle size of about 3 nm. The electrochemical active surface area of Pt of 42 +/- 14 m(2) g(-1) was determined by the cyclic voltammetry technique. The kinetics of the HOR was investigated by linear sweep voltammetry at a rotating disc electrode in 0.5 mol dm(-3) HClO(4) solution. The determined value of the Tafel slope of 35 mV dec(-1) and an exchange current density of 0.45 mA cm(-2) per real surface area of the Pt are in good accordance with those already reported in the literature for the HOR at polycrystalline Pt and Pt nanocatalysts in acid solutions. This new catalyst exhibited better activity for the HOR in comparison with Pt nanocatalyst supported on Vulcan (R) XC-72R high area carbon.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - A novel platinum-based nanocatalyst at a niobia-doped titania support for the hydrogen oxidation reaction
EP  - 1152
IS  - 8
SP  - 1139
VL  - 76
DO  - 10.2298/JSC100823100E
ER  - 

@article{
author = "Elezović, Nevenka R. and Babić, Biljana M. and Radmilović, Velimir R and Gajić-Krstajić, Ljiljana M and Krstajić, Nedeljko V and Vračar, Ljiljana M",
year = "2011",
abstract = "The kinetics of the hydrogen oxidation reaction (HOR) was studied at Pt nanoparticles supported on niobia-doped titania (Pt/N-T). The catalyst support, with the composition of 0.05NbO(2.5-delta)-0.995TiO(2) (0  lt  delta  lt  1), was synthesized by a modified sol gel procedure and characterized by the BET and X-ray diffraction (XRD) techniques. The specific surface area of the support was found to be 70 m(2) g(-1). The XRD analysis revealed the presence of the anatase TiO(2) phase in the support powder. No peaks indicating the existence of Nb-compounds were detected. Pt/N-T nanocatalyst was synthesized by the borohydride reduction method. Transmission electron microscopy revealed a quite homogenous distribution of the Pt nanoparticles over the support, with a mean particle size of about 3 nm. The electrochemical active surface area of Pt of 42 +/- 14 m(2) g(-1) was determined by the cyclic voltammetry technique. The kinetics of the HOR was investigated by linear sweep voltammetry at a rotating disc electrode in 0.5 mol dm(-3) HClO(4) solution. The determined value of the Tafel slope of 35 mV dec(-1) and an exchange current density of 0.45 mA cm(-2) per real surface area of the Pt are in good accordance with those already reported in the literature for the HOR at polycrystalline Pt and Pt nanocatalysts in acid solutions. This new catalyst exhibited better activity for the HOR in comparison with Pt nanocatalyst supported on Vulcan (R) XC-72R high area carbon.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "A novel platinum-based nanocatalyst at a niobia-doped titania support for the hydrogen oxidation reaction",
pages = "1152-1139",
number = "8",
volume = "76",
doi = "10.2298/JSC100823100E"
}

Elezović, N. R., Babić, B. M., Radmilović, V. R., Gajić-Krstajić, L. M., Krstajić, N. V.,& Vračar, L. M.. (2011). A novel platinum-based nanocatalyst at a niobia-doped titania support for the hydrogen oxidation reaction. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 76(8), 1139-1152.
https://doi.org/10.2298/JSC100823100E

Elezović NR, Babić BM, Radmilović VR, Gajić-Krstajić LM, Krstajić NV, Vračar LM. A novel platinum-based nanocatalyst at a niobia-doped titania support for the hydrogen oxidation reaction. in Journal of the Serbian Chemical Society. 2011;76(8):1139-1152.
doi:10.2298/JSC100823100E .

Elezović, Nevenka R., Babić, Biljana M., Radmilović, Velimir R, Gajić-Krstajić, Ljiljana M, Krstajić, Nedeljko V, Vračar, Ljiljana M, "A novel platinum-based nanocatalyst at a niobia-doped titania support for the hydrogen oxidation reaction" in Journal of the Serbian Chemical Society, 76, no. 8 (2011):1139-1152,
https://doi.org/10.2298/JSC100823100E . .

TY  - JOUR
AU  - Elezović, Nevenka R.
AU  - Babić, Biljana M.
AU  - Gajić-Krstajić, Ljiljana M
AU  - Radmilović, Velimir R
AU  - Krstajić, Nedeljko V
AU  - Vračar, Ljiljana M
PY  - 2010
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/426
AB  - In order to point out the effect of the support to the catalyst for oxygen reduction reaction nano-crystalline Nb-doped TiO2 was synthesized through a modified sol-gel route procedure. The specific surface area of the support, S-BET, and pore size distribution, were calculated from the adsorption isotherms using the gravimetric McBain method. The support was characterized by X-ray diffraction (XRD) technique. The borohydride reduction method was used to prepare Nb-TiO2 supported Pt (20 wt.%) catalyst. The synthesized catalyst was analyzed by TEM technique. Finally, the catalytic activity of this new catalyst for oxygen reduction reaction was investigated in acid solution, in the absence and the presence of methanol, and its activity was compared towards the results on C/Pt catalysts. Kinetic analysis reveals that the oxygen reduction reaction on Nb-TiO2/Pt catalyst follows four-electron process leading to water, as in the case of C/Pt electrode, but the Tafel plots normalized to the electrochemically active surface area show very remarkable enhancement in activity of Nb-TiO2/Pt expressed through the value of the current density at the constant potential. Moreover, Nb-TiO2/Pt catalyst exhibits higher methanol tolerance during the oxygen reduction reaction than the C/Pt catalyst. The enhancement in the activity of Nb-TiO2/Pt is consequence of both: the interactions of Pt nanoparticles with the support and the energy shift of the surface d-states with respect to the Fermi level what changes the surface reactivity.
PB  - Elsevier Science Bv, Amsterdam
T2  - Journal of Power Sources
T1  - Synthesis, characterization and electrocatalytical behavior of Nb-TiO2/Pt nanocatalyst for oxygen reduction reaction
EP  - 3968
IS  - 13
SP  - 3961
VL  - 195
DO  - 10.1016/j.jpowsour.2010.01.035
ER  - 

@article{
author = "Elezović, Nevenka R. and Babić, Biljana M. and Gajić-Krstajić, Ljiljana M and Radmilović, Velimir R and Krstajić, Nedeljko V and Vračar, Ljiljana M",
year = "2010",
abstract = "In order to point out the effect of the support to the catalyst for oxygen reduction reaction nano-crystalline Nb-doped TiO2 was synthesized through a modified sol-gel route procedure. The specific surface area of the support, S-BET, and pore size distribution, were calculated from the adsorption isotherms using the gravimetric McBain method. The support was characterized by X-ray diffraction (XRD) technique. The borohydride reduction method was used to prepare Nb-TiO2 supported Pt (20 wt.%) catalyst. The synthesized catalyst was analyzed by TEM technique. Finally, the catalytic activity of this new catalyst for oxygen reduction reaction was investigated in acid solution, in the absence and the presence of methanol, and its activity was compared towards the results on C/Pt catalysts. Kinetic analysis reveals that the oxygen reduction reaction on Nb-TiO2/Pt catalyst follows four-electron process leading to water, as in the case of C/Pt electrode, but the Tafel plots normalized to the electrochemically active surface area show very remarkable enhancement in activity of Nb-TiO2/Pt expressed through the value of the current density at the constant potential. Moreover, Nb-TiO2/Pt catalyst exhibits higher methanol tolerance during the oxygen reduction reaction than the C/Pt catalyst. The enhancement in the activity of Nb-TiO2/Pt is consequence of both: the interactions of Pt nanoparticles with the support and the energy shift of the surface d-states with respect to the Fermi level what changes the surface reactivity.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Journal of Power Sources",
title = "Synthesis, characterization and electrocatalytical behavior of Nb-TiO2/Pt nanocatalyst for oxygen reduction reaction",
pages = "3968-3961",
number = "13",
volume = "195",
doi = "10.1016/j.jpowsour.2010.01.035"
}

Elezović, N. R., Babić, B. M., Gajić-Krstajić, L. M., Radmilović, V. R., Krstajić, N. V.,& Vračar, L. M.. (2010). Synthesis, characterization and electrocatalytical behavior of Nb-TiO2/Pt nanocatalyst for oxygen reduction reaction. in Journal of Power Sources
Elsevier Science Bv, Amsterdam., 195(13), 3961-3968.
https://doi.org/10.1016/j.jpowsour.2010.01.035

Elezović NR, Babić BM, Gajić-Krstajić LM, Radmilović VR, Krstajić NV, Vračar LM. Synthesis, characterization and electrocatalytical behavior of Nb-TiO2/Pt nanocatalyst for oxygen reduction reaction. in Journal of Power Sources. 2010;195(13):3961-3968.
doi:10.1016/j.jpowsour.2010.01.035 .

Elezović, Nevenka R., Babić, Biljana M., Gajić-Krstajić, Ljiljana M, Radmilović, Velimir R, Krstajić, Nedeljko V, Vračar, Ljiljana M, "Synthesis, characterization and electrocatalytical behavior of Nb-TiO2/Pt nanocatalyst for oxygen reduction reaction" in Journal of Power Sources, 195, no. 13 (2010):3961-3968,
https://doi.org/10.1016/j.jpowsour.2010.01.035 . .

TY  - JOUR
AU  - Elezović, Nevenka R.
AU  - Gajić-Krstajić, Ljiljana M
AU  - Vračar, Ljiljana M
AU  - Krstajić, Nedeljko V
PY  - 2010
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/433
AB  - The influence of poisoning of MoOx-Pt catalyst by CO on the kinetics of H-2 oxidation reaction (HOR) at MoOx-Pt electrode in 0 5 mol dm(-3) HClO4 saturated with H-2 containing 100 ppm CO was examined on rotating disc electrode (RIDE) at 25 C MoOx-Pt nano catalyst prepared by the polyole method combined with MoOx post deposition was supported on commercial carbon black Vulcan XC 72 The MoOx-Pt/C catalyst was characterized by TEM technique The catalyst composition is very similar to the nominal one and post deposited MoOx species block only a small fraction of the active Pt particle surface area MoOx deposition on the carbon support can be ruled out from the EDAX results and from the low mobility of these oxides under used conditions Based on Tafel-Heyrovsky-Volmer mechanism the corresponding kinetic equations from a dual pathway model were derived to describe oxidation current potential behavior on RIDE over entire potential range at venous CO coverages The polarization RIDE curves were fitted with derived polarization equations according to the proposed model The fitting showed that the HOR proceeded most likely via the Tafel-Volmer (TV) pathway A very high electrocatalytic activity observed at MoOx-Pt catalyst for the hydrogen oxidation reaction in the presence of 100 ppm CO is achieved through chemical surface reaction of adsorbed CO with Mo surface oxides
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - International Journal of Hydrogen Energy
T1  - Effect of chemisorbed CO on MoOx-Pt/C electrode on the kinetics of hydrogen oxidation reaction
EP  - 12887
IS  - 23
SP  - 12878
VL  - 35
DO  - 10.1016/j.ijhydene.2010.09.004
ER  - 

@article{
author = "Elezović, Nevenka R. and Gajić-Krstajić, Ljiljana M and Vračar, Ljiljana M and Krstajić, Nedeljko V",
year = "2010",
abstract = "The influence of poisoning of MoOx-Pt catalyst by CO on the kinetics of H-2 oxidation reaction (HOR) at MoOx-Pt electrode in 0 5 mol dm(-3) HClO4 saturated with H-2 containing 100 ppm CO was examined on rotating disc electrode (RIDE) at 25 C MoOx-Pt nano catalyst prepared by the polyole method combined with MoOx post deposition was supported on commercial carbon black Vulcan XC 72 The MoOx-Pt/C catalyst was characterized by TEM technique The catalyst composition is very similar to the nominal one and post deposited MoOx species block only a small fraction of the active Pt particle surface area MoOx deposition on the carbon support can be ruled out from the EDAX results and from the low mobility of these oxides under used conditions Based on Tafel-Heyrovsky-Volmer mechanism the corresponding kinetic equations from a dual pathway model were derived to describe oxidation current potential behavior on RIDE over entire potential range at venous CO coverages The polarization RIDE curves were fitted with derived polarization equations according to the proposed model The fitting showed that the HOR proceeded most likely via the Tafel-Volmer (TV) pathway A very high electrocatalytic activity observed at MoOx-Pt catalyst for the hydrogen oxidation reaction in the presence of 100 ppm CO is achieved through chemical surface reaction of adsorbed CO with Mo surface oxides",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "International Journal of Hydrogen Energy",
title = "Effect of chemisorbed CO on MoOx-Pt/C electrode on the kinetics of hydrogen oxidation reaction",
pages = "12887-12878",
number = "23",
volume = "35",
doi = "10.1016/j.ijhydene.2010.09.004"
}

Elezović, N. R., Gajić-Krstajić, L. M., Vračar, L. M.,& Krstajić, N. V.. (2010). Effect of chemisorbed CO on MoOx-Pt/C electrode on the kinetics of hydrogen oxidation reaction. in International Journal of Hydrogen Energy
Pergamon-Elsevier Science Ltd, Oxford., 35(23), 12878-12887.
https://doi.org/10.1016/j.ijhydene.2010.09.004

Elezović NR, Gajić-Krstajić LM, Vračar LM, Krstajić NV. Effect of chemisorbed CO on MoOx-Pt/C electrode on the kinetics of hydrogen oxidation reaction. in International Journal of Hydrogen Energy. 2010;35(23):12878-12887.
doi:10.1016/j.ijhydene.2010.09.004 .

Elezović, Nevenka R., Gajić-Krstajić, Ljiljana M, Vračar, Ljiljana M, Krstajić, Nedeljko V, "Effect of chemisorbed CO on MoOx-Pt/C electrode on the kinetics of hydrogen oxidation reaction" in International Journal of Hydrogen Energy, 35, no. 23 (2010):12878-12887,
https://doi.org/10.1016/j.ijhydene.2010.09.004 . .

TY  - JOUR
AU  - Babić, Biljana M.
AU  - Gulicovski, J.
AU  - Gajić-Krstajić, Ljiljana M
AU  - Elezović, Nevenka R.
AU  - Radmilović, Velimir R
AU  - Krstajić, Nedeljko V
AU  - Vračar, Ljiljana M
PY  - 2009
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/306
AB  - The kinetics and mechanism of the hydrogen oxidation reaction were studied in 0.5 mol dm(-3) HClO4 solution on an electrode based on titanium oxide with Magneli phase structure-supported platinum electrocatalyst applied on rotation Au disk electrode. Pt catalyst was prepared by impregnation method from 2-propanol solution of Pt(NH3)(2)(NO2)(2) and sub-stoichiometric titanium oxide powder. Sub-stiochiometric titanium oxide Support was characterized by X-ray diffraction and BET techniques. The synthesized catalyst was analyzed by TEM technique. Based on Tafel-Heyrovsky-Volmer mechanism the corresponding kinetic equations were derived to describe the hydrogen oxidation current-potential behavior on RDE over the entire potential region. The polarization RIDE curves were fitted with derived polarization equations according to proposed model. The fitting shows that the HOR on Pt proceeds most likely via the Tafel-Volmer (TV) pathway in the lower potential region, while the Heyrovsky-Volmer (HV) pathway is operative in the higher potential region. It is pointed out that Tafel equation that has been frequently used for the kinetics analysis in the HOR, can not reproduce the polarization curves measured with high mass-transport rates. Polarization measurements on RDE revealed that the Pt catalyst deposited on titanium suboxide support showed equal specific activity for the HOR compared to conventional carbon-supported Pt fuel cell catalyst.
PB  - Elsevier Science Bv, Amsterdam
T2  - Journal of Power Sources
T1  - Kinetic study of the hydrogen oxidation reaction on sub-stoichiometric titanium oxide-supported platinum electrocatalyst in acid solution
EP  - 106
IS  - 1
SP  - 99
VL  - 193
DO  - 10.1016/j.jpowsour.2008.11.142
ER  - 

@article{
author = "Babić, Biljana M. and Gulicovski, J. and Gajić-Krstajić, Ljiljana M and Elezović, Nevenka R. and Radmilović, Velimir R and Krstajić, Nedeljko V and Vračar, Ljiljana M",
year = "2009",
abstract = "The kinetics and mechanism of the hydrogen oxidation reaction were studied in 0.5 mol dm(-3) HClO4 solution on an electrode based on titanium oxide with Magneli phase structure-supported platinum electrocatalyst applied on rotation Au disk electrode. Pt catalyst was prepared by impregnation method from 2-propanol solution of Pt(NH3)(2)(NO2)(2) and sub-stoichiometric titanium oxide powder. Sub-stiochiometric titanium oxide Support was characterized by X-ray diffraction and BET techniques. The synthesized catalyst was analyzed by TEM technique. Based on Tafel-Heyrovsky-Volmer mechanism the corresponding kinetic equations were derived to describe the hydrogen oxidation current-potential behavior on RDE over the entire potential region. The polarization RIDE curves were fitted with derived polarization equations according to proposed model. The fitting shows that the HOR on Pt proceeds most likely via the Tafel-Volmer (TV) pathway in the lower potential region, while the Heyrovsky-Volmer (HV) pathway is operative in the higher potential region. It is pointed out that Tafel equation that has been frequently used for the kinetics analysis in the HOR, can not reproduce the polarization curves measured with high mass-transport rates. Polarization measurements on RDE revealed that the Pt catalyst deposited on titanium suboxide support showed equal specific activity for the HOR compared to conventional carbon-supported Pt fuel cell catalyst.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Journal of Power Sources",
title = "Kinetic study of the hydrogen oxidation reaction on sub-stoichiometric titanium oxide-supported platinum electrocatalyst in acid solution",
pages = "106-99",
number = "1",
volume = "193",
doi = "10.1016/j.jpowsour.2008.11.142"
}

Babić, B. M., Gulicovski, J., Gajić-Krstajić, L. M., Elezović, N. R., Radmilović, V. R., Krstajić, N. V.,& Vračar, L. M.. (2009). Kinetic study of the hydrogen oxidation reaction on sub-stoichiometric titanium oxide-supported platinum electrocatalyst in acid solution. in Journal of Power Sources
Elsevier Science Bv, Amsterdam., 193(1), 99-106.
https://doi.org/10.1016/j.jpowsour.2008.11.142

Babić BM, Gulicovski J, Gajić-Krstajić LM, Elezović NR, Radmilović VR, Krstajić NV, Vračar LM. Kinetic study of the hydrogen oxidation reaction on sub-stoichiometric titanium oxide-supported platinum electrocatalyst in acid solution. in Journal of Power Sources. 2009;193(1):99-106.
doi:10.1016/j.jpowsour.2008.11.142 .

Babić, Biljana M., Gulicovski, J., Gajić-Krstajić, Ljiljana M, Elezović, Nevenka R., Radmilović, Velimir R, Krstajić, Nedeljko V, Vračar, Ljiljana M, "Kinetic study of the hydrogen oxidation reaction on sub-stoichiometric titanium oxide-supported platinum electrocatalyst in acid solution" in Journal of Power Sources, 193, no. 1 (2009):99-106,
https://doi.org/10.1016/j.jpowsour.2008.11.142 . .

TY  - JOUR
AU  - Elezović, Nevenka R.
AU  - Gajić-Krstajić, Ljiljana M
AU  - Radmilović, Velimir R
AU  - Vračar, Ljiljana M
AU  - Krstajić, Nedeljko V
PY  - 2009
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/322
AB  - The influence of poisoning of Pt catalyst by CO on the kinetics and mechanism of H-2 oxidation reaction (HOR) at Pt/C electrode in 0.5 mol dm(-3) HClO4, saturated with H-2 containing 100 ppm CO, was examined with rotating disc electrode (RDE) at 22 degrees C. Commercial carbon black, Vulcan XC-72 was used as support, while Pt/C catalyst was prepared by modified polyol synthesis method in an ethylene glycol (EG) solution. The kinetically controlled current (l(k)) for the HOR at Pt/C decreases significantly at CO coverage (Theta(co)) > 0.6. For Theta(co)  lt  0.6 the HOR takes place through Tafel-Volmer mechanism with Tafel reaction as rate-determining step at the low CO coverage, while Volmer step controls the overall reaction rate at the medium CO coverage. When CO coverage is higher then 0.6, Heyrovsky-Volmer mechanism is operative for the HOR with Heyrovsky as the rate-determining step (rds).
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Electrochimica Acta
T1  - Effect of chemisorbed carbon monoxide on Pt/C electrode on the mechanism of the hydrogen oxidation reaction
EP  - 1382
IS  - 4
SP  - 1375
VL  - 54
DO  - 10.1016/j.electacta.2008.08.067
ER  - 

@article{
author = "Elezović, Nevenka R. and Gajić-Krstajić, Ljiljana M and Radmilović, Velimir R and Vračar, Ljiljana M and Krstajić, Nedeljko V",
year = "2009",
abstract = "The influence of poisoning of Pt catalyst by CO on the kinetics and mechanism of H-2 oxidation reaction (HOR) at Pt/C electrode in 0.5 mol dm(-3) HClO4, saturated with H-2 containing 100 ppm CO, was examined with rotating disc electrode (RDE) at 22 degrees C. Commercial carbon black, Vulcan XC-72 was used as support, while Pt/C catalyst was prepared by modified polyol synthesis method in an ethylene glycol (EG) solution. The kinetically controlled current (l(k)) for the HOR at Pt/C decreases significantly at CO coverage (Theta(co)) > 0.6. For Theta(co)  lt  0.6 the HOR takes place through Tafel-Volmer mechanism with Tafel reaction as rate-determining step at the low CO coverage, while Volmer step controls the overall reaction rate at the medium CO coverage. When CO coverage is higher then 0.6, Heyrovsky-Volmer mechanism is operative for the HOR with Heyrovsky as the rate-determining step (rds).",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Electrochimica Acta",
title = "Effect of chemisorbed carbon monoxide on Pt/C electrode on the mechanism of the hydrogen oxidation reaction",
pages = "1382-1375",
number = "4",
volume = "54",
doi = "10.1016/j.electacta.2008.08.067"
}

Elezović, N. R., Gajić-Krstajić, L. M., Radmilović, V. R., Vračar, L. M.,& Krstajić, N. V.. (2009). Effect of chemisorbed carbon monoxide on Pt/C electrode on the mechanism of the hydrogen oxidation reaction. in Electrochimica Acta
Pergamon-Elsevier Science Ltd, Oxford., 54(4), 1375-1382.
https://doi.org/10.1016/j.electacta.2008.08.067

Elezović NR, Gajić-Krstajić LM, Radmilović VR, Vračar LM, Krstajić NV. Effect of chemisorbed carbon monoxide on Pt/C electrode on the mechanism of the hydrogen oxidation reaction. in Electrochimica Acta. 2009;54(4):1375-1382.
doi:10.1016/j.electacta.2008.08.067 .

Elezović, Nevenka R., Gajić-Krstajić, Ljiljana M, Radmilović, Velimir R, Vračar, Ljiljana M, Krstajić, Nedeljko V, "Effect of chemisorbed carbon monoxide on Pt/C electrode on the mechanism of the hydrogen oxidation reaction" in Electrochimica Acta, 54, no. 4 (2009):1375-1382,
https://doi.org/10.1016/j.electacta.2008.08.067 . .

TY  - JOUR
AU  - Elezović, Nevenka R.
AU  - Babić, Biljana M.
AU  - Krstajić, Nedeljko V
AU  - Gajić-Krstajić, Ljiljana M
AU  - Vračar, Ljiljana M
PY  - 2007
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/225
AB  - Home-made carbon cryogel synthesized by sol-gel polycondensation and freeze-drying is used as support for preparation of highly dispersed Pt catalyst that is made by a modified polyol synthesis method in an ethylene glycol (EG) solution. Specific surface area of carbon support and Pt/C catalyst is determined from nitrogen adsorption isotherm. The adsorption isotherm demonstrates a significant mesoporosity of carbon support. Specific surface area of the carbon support, calculated by the BET equation, is found to be 573 m(2) g(-1). X-ray diffraction (XRD) results demonstrate a successful reduction of the Pt precursor to its metallic form, and transmission electron microscopy (TEM) images show very uniform Pt particle size distribution with mean particle size of about 2.7 +/- 0.7 nm of the catalyst. Potentiodynamic studies of the underpotential deposition of hydrogen (H-upd) on Pt/C electrode in 0.5 mol dm(-3) HClO4 aqueous solution in the temperature range from 274 to 318 K are made, and thermodynamic state functions for the hydrogen adsorption are determined. The experimental results are analyzed assuming linear variation of the Gibbs energy of adsorption versus theta H-upd on the basis of the surface heterogeneity. The increase of Delta G(Hupd)(theta) with the surface coverage indicates the repulsive interactions between H-upd adatoms. From the temperature dependence of the Gibbs energy of adsorption, the enthalpy and the entropy of adsorption are calculated. The values of these functions are determined to be Delta H-Hupd(theta=0) = -5.6 kJ mol(-1) and Delta S-Hupd(theta=0) = 69.1 J mol(-1) K-1 The value of Delta H-Hupd(theta) allows determinations of the bond energy between electrode surface and H-upd that is found to be Ept-H = 223 kJ mol(-1) for theta = 0.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - International Journal of Hydrogen Energy
T1  - Specificity of the UPD of H to the structure of highly dispersed Pt on carbon support
EP  - 1998
IS  - 12
SP  - 1991
VL  - 32
DO  - 10.1016/j.ijhydene.2006.09.042
ER  - 

@article{
author = "Elezović, Nevenka R. and Babić, Biljana M. and Krstajić, Nedeljko V and Gajić-Krstajić, Ljiljana M and Vračar, Ljiljana M",
year = "2007",
abstract = "Home-made carbon cryogel synthesized by sol-gel polycondensation and freeze-drying is used as support for preparation of highly dispersed Pt catalyst that is made by a modified polyol synthesis method in an ethylene glycol (EG) solution. Specific surface area of carbon support and Pt/C catalyst is determined from nitrogen adsorption isotherm. The adsorption isotherm demonstrates a significant mesoporosity of carbon support. Specific surface area of the carbon support, calculated by the BET equation, is found to be 573 m(2) g(-1). X-ray diffraction (XRD) results demonstrate a successful reduction of the Pt precursor to its metallic form, and transmission electron microscopy (TEM) images show very uniform Pt particle size distribution with mean particle size of about 2.7 +/- 0.7 nm of the catalyst. Potentiodynamic studies of the underpotential deposition of hydrogen (H-upd) on Pt/C electrode in 0.5 mol dm(-3) HClO4 aqueous solution in the temperature range from 274 to 318 K are made, and thermodynamic state functions for the hydrogen adsorption are determined. The experimental results are analyzed assuming linear variation of the Gibbs energy of adsorption versus theta H-upd on the basis of the surface heterogeneity. The increase of Delta G(Hupd)(theta) with the surface coverage indicates the repulsive interactions between H-upd adatoms. From the temperature dependence of the Gibbs energy of adsorption, the enthalpy and the entropy of adsorption are calculated. The values of these functions are determined to be Delta H-Hupd(theta=0) = -5.6 kJ mol(-1) and Delta S-Hupd(theta=0) = 69.1 J mol(-1) K-1 The value of Delta H-Hupd(theta) allows determinations of the bond energy between electrode surface and H-upd that is found to be Ept-H = 223 kJ mol(-1) for theta = 0.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "International Journal of Hydrogen Energy",
title = "Specificity of the UPD of H to the structure of highly dispersed Pt on carbon support",
pages = "1998-1991",
number = "12",
volume = "32",
doi = "10.1016/j.ijhydene.2006.09.042"
}

Elezović, N. R., Babić, B. M., Krstajić, N. V., Gajić-Krstajić, L. M.,& Vračar, L. M.. (2007). Specificity of the UPD of H to the structure of highly dispersed Pt on carbon support. in International Journal of Hydrogen Energy
Pergamon-Elsevier Science Ltd, Oxford., 32(12), 1991-1998.
https://doi.org/10.1016/j.ijhydene.2006.09.042

Elezović NR, Babić BM, Krstajić NV, Gajić-Krstajić LM, Vračar LM. Specificity of the UPD of H to the structure of highly dispersed Pt on carbon support. in International Journal of Hydrogen Energy. 2007;32(12):1991-1998.
doi:10.1016/j.ijhydene.2006.09.042 .

Elezović, Nevenka R., Babić, Biljana M., Krstajić, Nedeljko V, Gajić-Krstajić, Ljiljana M, Vračar, Ljiljana M, "Specificity of the UPD of H to the structure of highly dispersed Pt on carbon support" in International Journal of Hydrogen Energy, 32, no. 12 (2007):1991-1998,
https://doi.org/10.1016/j.ijhydene.2006.09.042 . .