TY  - JOUR
AU  - Elezović, Nevenka R.
AU  - Babić, Biljana M.
AU  - Radmilović, Velimir R
AU  - Vračar, Ljiljana M
AU  - Krstajić, Nedeljko V
PY  - 2013
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/716
AB  - Ruthenium doped titanium oxide support was synthesized. The support was characterized by BET (Brunauer, Emmett, Teller) and X-ray diffraction techniques (XRD). Determined specific surface area was 41 m(2) g(-1). XRD revealed presence mainly TiO2 anatase phase and some peaks belonging to rutile phase. No Ru compounds have been detected. Platinum based catalyst on this support was prepared by borohydride reduction method. The catalyst was characterized by scanning transmission electron microscopy (STEM, HAADF) and electron energy loss spectroscopy (EELS). Homogenous Pt particle distribution over the support, with average Pt nanoparticle diameter of 3 nm was found. This novel catalyst was tested for oxygen reduction in acid solution. It exhibited remarkable higher catalytic activity in comparison with Pt/C, as well as with Pt nanocatalysts at titanium oxide based supports, reported in literature.
PB  - Elsevier, Amsterdam
T2  - Applied Catalysis B-Environmental
T1  - Novel Pt catalyst on ruthenium doped TiO2 support for oxygen reduction reaction
EP  - 212
SP  - 206
VL  - 140
DO  - 10.1016/j.apcatb.2013.04.012
ER  - 

@article{
author = "Elezović, Nevenka R. and Babić, Biljana M. and Radmilović, Velimir R and Vračar, Ljiljana M and Krstajić, Nedeljko V",
year = "2013",
abstract = "Ruthenium doped titanium oxide support was synthesized. The support was characterized by BET (Brunauer, Emmett, Teller) and X-ray diffraction techniques (XRD). Determined specific surface area was 41 m(2) g(-1). XRD revealed presence mainly TiO2 anatase phase and some peaks belonging to rutile phase. No Ru compounds have been detected. Platinum based catalyst on this support was prepared by borohydride reduction method. The catalyst was characterized by scanning transmission electron microscopy (STEM, HAADF) and electron energy loss spectroscopy (EELS). Homogenous Pt particle distribution over the support, with average Pt nanoparticle diameter of 3 nm was found. This novel catalyst was tested for oxygen reduction in acid solution. It exhibited remarkable higher catalytic activity in comparison with Pt/C, as well as with Pt nanocatalysts at titanium oxide based supports, reported in literature.",
publisher = "Elsevier, Amsterdam",
journal = "Applied Catalysis B-Environmental",
title = "Novel Pt catalyst on ruthenium doped TiO2 support for oxygen reduction reaction",
pages = "212-206",
volume = "140",
doi = "10.1016/j.apcatb.2013.04.012"
}

Elezović, N. R., Babić, B. M., Radmilović, V. R., Vračar, L. M.,& Krstajić, N. V.. (2013). Novel Pt catalyst on ruthenium doped TiO2 support for oxygen reduction reaction. in Applied Catalysis B-Environmental
Elsevier, Amsterdam., 140, 206-212.
https://doi.org/10.1016/j.apcatb.2013.04.012

Elezović NR, Babić BM, Radmilović VR, Vračar LM, Krstajić NV. Novel Pt catalyst on ruthenium doped TiO2 support for oxygen reduction reaction. in Applied Catalysis B-Environmental. 2013;140:206-212.
doi:10.1016/j.apcatb.2013.04.012 .

Elezović, Nevenka R., Babić, Biljana M., Radmilović, Velimir R, Vračar, Ljiljana M, Krstajić, Nedeljko V, "Novel Pt catalyst on ruthenium doped TiO2 support for oxygen reduction reaction" in Applied Catalysis B-Environmental, 140 (2013):206-212,
https://doi.org/10.1016/j.apcatb.2013.04.012 . .

TY  - JOUR
AU  - Elezović, Nevenka R.
AU  - Babić, Biljana M.
AU  - Ercius, P
AU  - Radmilović, Velimir R
AU  - Vračar, Ljiljana M
AU  - Krstajić, Nedeljko V
PY  - 2012
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/596
AB  - Platinum nanocatalysts on two tungsten based supports have been synthesized and characterized as catalysts for oxygen reduction reaction in 0.5 mol dm(-3) HClO4 solution, at 25 degrees C. Tungsten based support assigned WCctabr has been synthesized by polycondensation of resorcinol and formaldehyde in the presence of CTABr surfactant. Support assigned WCwo(3) was synthesized from resorcinol/formaldehyde gel, using WO3 nanoparticles as starting material. Supporting materials have been characterized by BET (Brunauer, Emmett and Teller) technique and determined values of surface area were 80 m(2) g(-1) for WCctabr and 175 m(2) g(-1) for WCWO3. Platinum nanocatalysts (10% Pt) at tungsten based supports have been prepared by borohydride reduction method. Both synthesized supports and catalysts have been characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and electron energy loss spectroscopy (EELS) techniques. Cyclic voltammetry was applied for determination of electrochemically active surface area (40 m2 g(-1) for Pt/WCWO3 and 55 m(2) g(-1) for Pt/WCctabr). Oxygen reduction reaction has been studied by cyclic voltammetry and linear sweep voltammetry at rotating disc electrode (RDE). These catalysts exhibited better catalytic activity, expressed in terms of kinetic current density per real surface area at the constant potential and better stability, in comparison with Pt/C catalyst, as well as with already reported catalytic activity values for Pt catalysts on tungsten based supports.
PB  - Elsevier Science Bv, Amsterdam
T2  - Applied Catalysis B-Environmental
T1  - Synthesis and characterization Pt nanocatalysts on tungsten based supports for oxygen reduction reaction
EP  - 397
SP  - 390
VL  - 125
DO  - 10.1016/j.apcatb.2012.06.008
ER  - 

@article{
author = "Elezović, Nevenka R. and Babić, Biljana M. and Ercius, P and Radmilović, Velimir R and Vračar, Ljiljana M and Krstajić, Nedeljko V",
year = "2012",
abstract = "Platinum nanocatalysts on two tungsten based supports have been synthesized and characterized as catalysts for oxygen reduction reaction in 0.5 mol dm(-3) HClO4 solution, at 25 degrees C. Tungsten based support assigned WCctabr has been synthesized by polycondensation of resorcinol and formaldehyde in the presence of CTABr surfactant. Support assigned WCwo(3) was synthesized from resorcinol/formaldehyde gel, using WO3 nanoparticles as starting material. Supporting materials have been characterized by BET (Brunauer, Emmett and Teller) technique and determined values of surface area were 80 m(2) g(-1) for WCctabr and 175 m(2) g(-1) for WCWO3. Platinum nanocatalysts (10% Pt) at tungsten based supports have been prepared by borohydride reduction method. Both synthesized supports and catalysts have been characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and electron energy loss spectroscopy (EELS) techniques. Cyclic voltammetry was applied for determination of electrochemically active surface area (40 m2 g(-1) for Pt/WCWO3 and 55 m(2) g(-1) for Pt/WCctabr). Oxygen reduction reaction has been studied by cyclic voltammetry and linear sweep voltammetry at rotating disc electrode (RDE). These catalysts exhibited better catalytic activity, expressed in terms of kinetic current density per real surface area at the constant potential and better stability, in comparison with Pt/C catalyst, as well as with already reported catalytic activity values for Pt catalysts on tungsten based supports.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Applied Catalysis B-Environmental",
title = "Synthesis and characterization Pt nanocatalysts on tungsten based supports for oxygen reduction reaction",
pages = "397-390",
volume = "125",
doi = "10.1016/j.apcatb.2012.06.008"
}

Elezović, N. R., Babić, B. M., Ercius, P., Radmilović, V. R., Vračar, L. M.,& Krstajić, N. V.. (2012). Synthesis and characterization Pt nanocatalysts on tungsten based supports for oxygen reduction reaction. in Applied Catalysis B-Environmental
Elsevier Science Bv, Amsterdam., 125, 390-397.
https://doi.org/10.1016/j.apcatb.2012.06.008

Elezović NR, Babić BM, Ercius P, Radmilović VR, Vračar LM, Krstajić NV. Synthesis and characterization Pt nanocatalysts on tungsten based supports for oxygen reduction reaction. in Applied Catalysis B-Environmental. 2012;125:390-397.
doi:10.1016/j.apcatb.2012.06.008 .

Elezović, Nevenka R., Babić, Biljana M., Ercius, P, Radmilović, Velimir R, Vračar, Ljiljana M, Krstajić, Nedeljko V, "Synthesis and characterization Pt nanocatalysts on tungsten based supports for oxygen reduction reaction" in Applied Catalysis B-Environmental, 125 (2012):390-397,
https://doi.org/10.1016/j.apcatb.2012.06.008 . .

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  - Obradović, Maja D
AU  - Gojković, Snežana Lj
AU  - Elezović, Nevenka R.
AU  - Ercius, P
AU  - Radmilović, Velimir R
AU  - Vračar, Ljiljana M
AU  - Krstajić, Nedeljko V
PY  - 2012
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/513
AB  - The catalytic activity of WC/Pt electrocatalysts towards hydrogen oxidation reaction (HOR) in acid solution was studied. Tungsten carbide (WC) prepared by polycondensation of resorcinol and formaldehyde in the presence of ammonium metatungstate salt and CTABr surfactant was used as the support of a Pt electrocatalyst (WC/Pt). The obtained WC/Pt electrodes were characterized by XRD, HRTEM, EDS, EELS and electrochemical measurements. HRTEM analysis showed that the WC particles possess a core-shell structure with a metallic tungsten core and a shell composed of a mixture of tungsten carbides shell (WC and W2C). The WC/Pt catalyst is composed of well-dispersed sub-nanometer Pt clusters which consist of a few to several tens of Pt atoms. EELS measurements indicate that the WC particles function as nucleation sites for Pt nanoparticles. Based on the Tafel-Heyrovsky-Volmer mechanism the corresponding kinetic equations were derived to describe the HOR current-potential behavior over the entire potential region on RDE. The fitting showed that in the lower potential region HOR on Pt proceeds most likely via the Tafel-Volmer (TV) pathway. The kinetic results also showed that the WC/Pt(1%) when compared to the standard C/Pt(1%) electrode led to a remarkable enhancement of the hydrogen oxidation in an acidic medium, which was explained by H-spill-over between platinum and tungsten carbide.
PB  - Elsevier Science Sa, Lausanne
T2  - Journal of Electroanalytical Chemistry
T1  - The kinetics of the hydrogen oxidation reaction on WC/Pt catalyst with low content of Pt nano-particles
EP  - 32
SP  - 24
VL  - 671
DO  - 10.1016/j.jelechem.2012.01.026
ER  - 

@article{
author = "Obradović, Maja D and Gojković, Snežana Lj and Elezović, Nevenka R. and Ercius, P and Radmilović, Velimir R and Vračar, Ljiljana M and Krstajić, Nedeljko V",
year = "2012",
abstract = "The catalytic activity of WC/Pt electrocatalysts towards hydrogen oxidation reaction (HOR) in acid solution was studied. Tungsten carbide (WC) prepared by polycondensation of resorcinol and formaldehyde in the presence of ammonium metatungstate salt and CTABr surfactant was used as the support of a Pt electrocatalyst (WC/Pt). The obtained WC/Pt electrodes were characterized by XRD, HRTEM, EDS, EELS and electrochemical measurements. HRTEM analysis showed that the WC particles possess a core-shell structure with a metallic tungsten core and a shell composed of a mixture of tungsten carbides shell (WC and W2C). The WC/Pt catalyst is composed of well-dispersed sub-nanometer Pt clusters which consist of a few to several tens of Pt atoms. EELS measurements indicate that the WC particles function as nucleation sites for Pt nanoparticles. Based on the Tafel-Heyrovsky-Volmer mechanism the corresponding kinetic equations were derived to describe the HOR current-potential behavior over the entire potential region on RDE. The fitting showed that in the lower potential region HOR on Pt proceeds most likely via the Tafel-Volmer (TV) pathway. The kinetic results also showed that the WC/Pt(1%) when compared to the standard C/Pt(1%) electrode led to a remarkable enhancement of the hydrogen oxidation in an acidic medium, which was explained by H-spill-over between platinum and tungsten carbide.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Journal of Electroanalytical Chemistry",
title = "The kinetics of the hydrogen oxidation reaction on WC/Pt catalyst with low content of Pt nano-particles",
pages = "32-24",
volume = "671",
doi = "10.1016/j.jelechem.2012.01.026"
}

Obradović, M. D., Gojković, S. L., Elezović, N. R., Ercius, P., Radmilović, V. R., Vračar, L. M.,& Krstajić, N. V.. (2012). The kinetics of the hydrogen oxidation reaction on WC/Pt catalyst with low content of Pt nano-particles. in Journal of Electroanalytical Chemistry
Elsevier Science Sa, Lausanne., 671, 24-32.
https://doi.org/10.1016/j.jelechem.2012.01.026

Obradović MD, Gojković SL, Elezović NR, Ercius P, Radmilović VR, Vračar LM, Krstajić NV. The kinetics of the hydrogen oxidation reaction on WC/Pt catalyst with low content of Pt nano-particles. in Journal of Electroanalytical Chemistry. 2012;671:24-32.
doi:10.1016/j.jelechem.2012.01.026 .

Obradović, Maja D, Gojković, Snežana Lj, Elezović, Nevenka R., Ercius, P, Radmilović, Velimir R, Vračar, Ljiljana M, Krstajić, Nedeljko V, "The kinetics of the hydrogen oxidation reaction on WC/Pt catalyst with low content of Pt nano-particles" in Journal of Electroanalytical Chemistry, 671 (2012):24-32,
https://doi.org/10.1016/j.jelechem.2012.01.026 . .

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  - Radmilović, Velimir R
AU  - Vračar, Ljiljana M
AU  - Krstajić, Nedeljko V
PY  - 2011
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/488
AB  - Platinum based nanocatalyst at home made Nb-TiO2 support was synthesized and characterized as the catalyst for oxygen reduction reaction in 0.1 mol dm(-3) NaOH, at 25 degrees C. Nb doped TiO2 catalyst support, containing 5% of Nb, has been synthesized by modified acid-catalyzed sol-gel procedure in non-aqueous medium. BET and X-ray diffraction (XRD) techniques were applied for characterization of synthesized supporting material. XRD analysis revealed only presence of anatase TiO2 phase in synthesized support powder. Existence of any peaks belonging to Nb compounds has not been observed, indicating Nb incorporated into the lattice. Nb-TiO2 supported Pt nanocatalyst synthesized, using borohydride reduction method, was characterized by TEM and HRTEM techniques. Platinum nanoparticles distribution, over Nb doped TiO2 support, was quite homogenous. Mean particle size of about 4 nm was found with no pronounced particle agglomeration. Electrochemical techniques: cyclic voltammetry and linear sweep voltammetry at rotating disc electrode were applied in order to study kinetics and estimate catalytic activity of this new catalyst for the oxygen reduction reaction in alkaline solution. Two different Tafel slopes were found: one close to -90 mV dec(-1) in low current density region and other approximately 200 my dec(-1) in high current density region, which is in good accordance with literature results for oxygen reduction at Pt single crystals, as well as Pt nanocatalysts in alkaline solutions. Similar specific catalytic activity (expressed in term of kinetic current density per real surface area) of Nb(5%)-TiO2/Pt catalyst for oxygen reduction reaction in comparison with the carbon supported platinum (Vulcan/Pt) nanocatalyst, was found.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Electrochimica Acta
T1  - Nb-TiO2 supported platinum nanocatalyst for oxygen reduction reaction in alkaline solutions
EP  - 9026
IS  - 25
SP  - 9020
VL  - 56
DO  - 10.1016/j.electacta.2011.04.075
ER  - 

@article{
author = "Elezović, Nevenka R. and Babić, Biljana M. and Radmilović, Velimir R and Vračar, Ljiljana M and Krstajić, Nedeljko V",
year = "2011",
abstract = "Platinum based nanocatalyst at home made Nb-TiO2 support was synthesized and characterized as the catalyst for oxygen reduction reaction in 0.1 mol dm(-3) NaOH, at 25 degrees C. Nb doped TiO2 catalyst support, containing 5% of Nb, has been synthesized by modified acid-catalyzed sol-gel procedure in non-aqueous medium. BET and X-ray diffraction (XRD) techniques were applied for characterization of synthesized supporting material. XRD analysis revealed only presence of anatase TiO2 phase in synthesized support powder. Existence of any peaks belonging to Nb compounds has not been observed, indicating Nb incorporated into the lattice. Nb-TiO2 supported Pt nanocatalyst synthesized, using borohydride reduction method, was characterized by TEM and HRTEM techniques. Platinum nanoparticles distribution, over Nb doped TiO2 support, was quite homogenous. Mean particle size of about 4 nm was found with no pronounced particle agglomeration. Electrochemical techniques: cyclic voltammetry and linear sweep voltammetry at rotating disc electrode were applied in order to study kinetics and estimate catalytic activity of this new catalyst for the oxygen reduction reaction in alkaline solution. Two different Tafel slopes were found: one close to -90 mV dec(-1) in low current density region and other approximately 200 my dec(-1) in high current density region, which is in good accordance with literature results for oxygen reduction at Pt single crystals, as well as Pt nanocatalysts in alkaline solutions. Similar specific catalytic activity (expressed in term of kinetic current density per real surface area) of Nb(5%)-TiO2/Pt catalyst for oxygen reduction reaction in comparison with the carbon supported platinum (Vulcan/Pt) nanocatalyst, was found.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Electrochimica Acta",
title = "Nb-TiO2 supported platinum nanocatalyst for oxygen reduction reaction in alkaline solutions",
pages = "9026-9020",
number = "25",
volume = "56",
doi = "10.1016/j.electacta.2011.04.075"
}

Elezović, N. R., Babić, B. M., Radmilović, V. R., Vračar, L. M.,& Krstajić, N. V.. (2011). Nb-TiO2 supported platinum nanocatalyst for oxygen reduction reaction in alkaline solutions. in Electrochimica Acta
Pergamon-Elsevier Science Ltd, Oxford., 56(25), 9020-9026.
https://doi.org/10.1016/j.electacta.2011.04.075

Elezović NR, Babić BM, Radmilović VR, Vračar LM, Krstajić NV. Nb-TiO2 supported platinum nanocatalyst for oxygen reduction reaction in alkaline solutions. in Electrochimica Acta. 2011;56(25):9020-9026.
doi:10.1016/j.electacta.2011.04.075 .

Elezović, Nevenka R., Babić, Biljana M., Radmilović, Velimir R, Vračar, Ljiljana M, Krstajić, Nedeljko V, "Nb-TiO2 supported platinum nanocatalyst for oxygen reduction reaction in alkaline solutions" in Electrochimica Acta, 56, no. 25 (2011):9020-9026,
https://doi.org/10.1016/j.electacta.2011.04.075 . .

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  - Babić, Biljana M.
AU  - Vračar, Ljiljana M
AU  - Radmilović, Velimir R
AU  - Krstajić, Nedeljko V
PY  - 2009
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/352
AB  - The hydrogen oxidation reaction (HOR) was studied at the home made TiOx-Pt/C nanocatalysts in 0.5 mol dm(-3) HClO4 at 25 degrees C. Pt/C catalyst was first synthesized by modified ethylene glycol method (EG) on commercially used carbon support (Vulcan XC-72). Then TiOx-Pt/C catalyst was prepared by the polyole method followed by TiOx post-deposition. The synthesized catalyst was characterized by XRD, TEM and EDX techniques. It was found that Pt/C catalyst nanoparticles were homogenously distributed over carbon support with the mean particle size of about 2.4 nm. The quite similar, homogenous distribution and particle size were obtained for Pt/C doped by TiOx catalyst which was the confirmation that TiOx post-deposition did not lead to significant growth of the Pt nanoparticles. The electrochemically active surface area of the catalyst was determined by using the cyclic voltammetry technique. The kinetics of hydrogen oxidation was investigated by the linear sweep voltammetry technique at the rotating disc electrode (RDE). The kinetic equations used for the analysis were derived considering the reversible or irreversible nature of the kinetics of the HOR. It was found that the hydrogen oxidation reaction for an investigated catalyst proceeded as an electrochemically reversible reaction. The values determined for the kinetic parameters-Tafel slope of 28 mV dec(-1) and exchange current density about 0.4 mA cm(Pt)(-2) are in good agreement with usually reported values for a hydrogen oxidation reaction with platinum catalysts in acid solutions.
PB  - Royal Soc Chemistry, Cambridge
T2  - Physical Chemistry Chemical Physics
T1  - Preparation and characterization TiOx-Pt/C catalyst for hydrogen oxidation reaction
EP  - 5197
IS  - 25
SP  - 5192
VL  - 11
DO  - 10.1039/b822249e
ER  - 

@article{
author = "Elezović, Nevenka R. and Babić, Biljana M. and Vračar, Ljiljana M and Radmilović, Velimir R and Krstajić, Nedeljko V",
year = "2009",
abstract = "The hydrogen oxidation reaction (HOR) was studied at the home made TiOx-Pt/C nanocatalysts in 0.5 mol dm(-3) HClO4 at 25 degrees C. Pt/C catalyst was first synthesized by modified ethylene glycol method (EG) on commercially used carbon support (Vulcan XC-72). Then TiOx-Pt/C catalyst was prepared by the polyole method followed by TiOx post-deposition. The synthesized catalyst was characterized by XRD, TEM and EDX techniques. It was found that Pt/C catalyst nanoparticles were homogenously distributed over carbon support with the mean particle size of about 2.4 nm. The quite similar, homogenous distribution and particle size were obtained for Pt/C doped by TiOx catalyst which was the confirmation that TiOx post-deposition did not lead to significant growth of the Pt nanoparticles. The electrochemically active surface area of the catalyst was determined by using the cyclic voltammetry technique. The kinetics of hydrogen oxidation was investigated by the linear sweep voltammetry technique at the rotating disc electrode (RDE). The kinetic equations used for the analysis were derived considering the reversible or irreversible nature of the kinetics of the HOR. It was found that the hydrogen oxidation reaction for an investigated catalyst proceeded as an electrochemically reversible reaction. The values determined for the kinetic parameters-Tafel slope of 28 mV dec(-1) and exchange current density about 0.4 mA cm(Pt)(-2) are in good agreement with usually reported values for a hydrogen oxidation reaction with platinum catalysts in acid solutions.",
publisher = "Royal Soc Chemistry, Cambridge",
journal = "Physical Chemistry Chemical Physics",
title = "Preparation and characterization TiOx-Pt/C catalyst for hydrogen oxidation reaction",
pages = "5197-5192",
number = "25",
volume = "11",
doi = "10.1039/b822249e"
}

Elezović, N. R., Babić, B. M., Vračar, L. M., Radmilović, V. R.,& Krstajić, N. V.. (2009). Preparation and characterization TiOx-Pt/C catalyst for hydrogen oxidation reaction. in Physical Chemistry Chemical Physics
Royal Soc Chemistry, Cambridge., 11(25), 5192-5197.
https://doi.org/10.1039/b822249e

Elezović NR, Babić BM, Vračar LM, Radmilović VR, Krstajić NV. Preparation and characterization TiOx-Pt/C catalyst for hydrogen oxidation reaction. in Physical Chemistry Chemical Physics. 2009;11(25):5192-5197.
doi:10.1039/b822249e .

Elezović, Nevenka R., Babić, Biljana M., Vračar, Ljiljana M, Radmilović, Velimir R, Krstajić, Nedeljko V, "Preparation and characterization TiOx-Pt/C catalyst for hydrogen oxidation reaction" in Physical Chemistry Chemical Physics, 11, no. 25 (2009):5192-5197,
https://doi.org/10.1039/b822249e . .

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  - Radmilović, Velimir R
AU  - Vračar, Ljiljana M
AU  - Krstajić, Nedeljko V
PY  - 2009
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/348
AB  - The oxygen reduction reaction (ORR) was studied at carbon supported MoOx-Pt/C and TiOx-Pt nanocatalysts in 0.5 mol dm(-3) HClO4 solution, at 25 degrees C. The MoOx-Pt/C and TiOx-Pt/C catalysts were prepared by the polyole method combined by MoOx or TiOx post-deposition. Home made catalysts were characterized by TEM and EDX techniques. It was found that catalyst nanoparticles were homogenously distributed over the carbon support with a mean particle size about 2.5 nm. Quite similar distribution and particle size was previously obtained for Pt/C catalyst. Results confirmed that MoOx and TiOx post-deposition did not lead to a significant growth of the Pt nanoparticles. The ORR kinetics was investigated by cyclic voltammetry and linear sweep voltammetry at the rotating disc electrode. These results showed the existence of two E - logj regions, usually observed with polycrystalline Pt in acid solution. It was proposed that the main path in the ORR mechanism on MoOx-Pt/C and TiOx-Pt/C catalysts was the direct four-electron process with the transfer of the first electron as the rate-determining step. The increase in catalytic activity for ORR on MoOx-Pt/C and TiOx-Pt/C catalysts, in comparison with Pt/C catalyst, was explained by synergetic effects due to the formation of the interface between the platinum and oxide materials and by spillover due to the surface diffusion of oxygen reaction intermediates.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Electrochimica Acta
T1  - Synthesis and characterization of MoOx-Pt/C and TiOx-Pt/C nano-catalysts for oxygen reduction
EP  - 2409
IS  - 9
SP  - 2404
VL  - 54
DO  - 10.1016/j.electacta.2008.03.015
ER  - 

@article{
author = "Elezović, Nevenka R. and Babić, Biljana M. and Radmilović, Velimir R and Vračar, Ljiljana M and Krstajić, Nedeljko V",
year = "2009",
abstract = "The oxygen reduction reaction (ORR) was studied at carbon supported MoOx-Pt/C and TiOx-Pt nanocatalysts in 0.5 mol dm(-3) HClO4 solution, at 25 degrees C. The MoOx-Pt/C and TiOx-Pt/C catalysts were prepared by the polyole method combined by MoOx or TiOx post-deposition. Home made catalysts were characterized by TEM and EDX techniques. It was found that catalyst nanoparticles were homogenously distributed over the carbon support with a mean particle size about 2.5 nm. Quite similar distribution and particle size was previously obtained for Pt/C catalyst. Results confirmed that MoOx and TiOx post-deposition did not lead to a significant growth of the Pt nanoparticles. The ORR kinetics was investigated by cyclic voltammetry and linear sweep voltammetry at the rotating disc electrode. These results showed the existence of two E - logj regions, usually observed with polycrystalline Pt in acid solution. It was proposed that the main path in the ORR mechanism on MoOx-Pt/C and TiOx-Pt/C catalysts was the direct four-electron process with the transfer of the first electron as the rate-determining step. The increase in catalytic activity for ORR on MoOx-Pt/C and TiOx-Pt/C catalysts, in comparison with Pt/C catalyst, was explained by synergetic effects due to the formation of the interface between the platinum and oxide materials and by spillover due to the surface diffusion of oxygen reaction intermediates.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Electrochimica Acta",
title = "Synthesis and characterization of MoOx-Pt/C and TiOx-Pt/C nano-catalysts for oxygen reduction",
pages = "2409-2404",
number = "9",
volume = "54",
doi = "10.1016/j.electacta.2008.03.015"
}

Elezović, N. R., Babić, B. M., Radmilović, V. R., Vračar, L. M.,& Krstajić, N. V.. (2009). Synthesis and characterization of MoOx-Pt/C and TiOx-Pt/C nano-catalysts for oxygen reduction. in Electrochimica Acta
Pergamon-Elsevier Science Ltd, Oxford., 54(9), 2404-2409.
https://doi.org/10.1016/j.electacta.2008.03.015

Elezović NR, Babić BM, Radmilović VR, Vračar LM, Krstajić NV. Synthesis and characterization of MoOx-Pt/C and TiOx-Pt/C nano-catalysts for oxygen reduction. in Electrochimica Acta. 2009;54(9):2404-2409.
doi:10.1016/j.electacta.2008.03.015 .

Elezović, Nevenka R., Babić, Biljana M., Radmilović, Velimir R, Vračar, Ljiljana M, Krstajić, Nedeljko V, "Synthesis and characterization of MoOx-Pt/C and TiOx-Pt/C nano-catalysts for oxygen reduction" in Electrochimica Acta, 54, no. 9 (2009):2404-2409,
https://doi.org/10.1016/j.electacta.2008.03.015 . .

TY  - JOUR
AU  - Elezović, Nevenka R.
AU  - Babić, Biljana M.
AU  - Krstajić, Nedeljko V
AU  - Gojković, Snežana Lj
AU  - Vračar, Ljiljana M
PY  - 2008
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/290
AB  - The temperature dependence of oxygen reduction reaction (ORR) was studied on highly dispersed Pt nanoparticles supported on a carbon cryogel. The specific surface area of the support was 5 17 m(2) g(-1), the Pt particles diameter was about 2.7 nm and the loading of the catalyst was 20 wt. %. The kinetics of the ORR at the Pt/C electrode was examined in 0.50 mol dm(-3) HClO4 solution in the temperature range from 274 to 318 K. At all temperatures, two distinct E-log j regions were observed at low current densities with a slope of -2.3RT/F and at high current densities with a slope of -2.3 x 2RT/F. In order to confirm the mechanism of oxygen reduction previously suggested at a polycrystalline Pt and a Pt/Ebonex nanostructured electrode, the apparent enthalpies of activation at selected potentials vs. the reversible hydrogen electrode were calculated in both current density regions. Although Delta H-a,l(not equal) > Delta H-a,h(not equal), it was found that the enthalpies of activation at the zero Galvani potential difference were the same and hence it could be concluded that the rate-determining step of the ORR was the same in both current density regions. The synthesized Pt/C catalyst showed a small enhancement in the catalytic activity for ORR in comparison to the polycrystalline Pt, but no change in the mechanism of the reaction.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - Temperature dependence of the kinetics of oxygen reduction on carbon-supported Pt nanoparticles
EP  - 654
IS  - 6
SP  - 641
VL  - 73
DO  - 10.2298/JSC0806641E
ER  - 

@article{
author = "Elezović, Nevenka R. and Babić, Biljana M. and Krstajić, Nedeljko V and Gojković, Snežana Lj and Vračar, Ljiljana M",
year = "2008",
abstract = "The temperature dependence of oxygen reduction reaction (ORR) was studied on highly dispersed Pt nanoparticles supported on a carbon cryogel. The specific surface area of the support was 5 17 m(2) g(-1), the Pt particles diameter was about 2.7 nm and the loading of the catalyst was 20 wt. %. The kinetics of the ORR at the Pt/C electrode was examined in 0.50 mol dm(-3) HClO4 solution in the temperature range from 274 to 318 K. At all temperatures, two distinct E-log j regions were observed at low current densities with a slope of -2.3RT/F and at high current densities with a slope of -2.3 x 2RT/F. In order to confirm the mechanism of oxygen reduction previously suggested at a polycrystalline Pt and a Pt/Ebonex nanostructured electrode, the apparent enthalpies of activation at selected potentials vs. the reversible hydrogen electrode were calculated in both current density regions. Although Delta H-a,l(not equal) > Delta H-a,h(not equal), it was found that the enthalpies of activation at the zero Galvani potential difference were the same and hence it could be concluded that the rate-determining step of the ORR was the same in both current density regions. The synthesized Pt/C catalyst showed a small enhancement in the catalytic activity for ORR in comparison to the polycrystalline Pt, but no change in the mechanism of the reaction.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "Temperature dependence of the kinetics of oxygen reduction on carbon-supported Pt nanoparticles",
pages = "654-641",
number = "6",
volume = "73",
doi = "10.2298/JSC0806641E"
}

Elezović, N. R., Babić, B. M., Krstajić, N. V., Gojković, S. L.,& Vračar, L. M.. (2008). Temperature dependence of the kinetics of oxygen reduction on carbon-supported Pt nanoparticles. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 73(6), 641-654.
https://doi.org/10.2298/JSC0806641E

Elezović NR, Babić BM, Krstajić NV, Gojković SL, Vračar LM. Temperature dependence of the kinetics of oxygen reduction on carbon-supported Pt nanoparticles. in Journal of the Serbian Chemical Society. 2008;73(6):641-654.
doi:10.2298/JSC0806641E .

Elezović, Nevenka R., Babić, Biljana M., Krstajić, Nedeljko V, Gojković, Snežana Lj, Vračar, Ljiljana M, "Temperature dependence of the kinetics of oxygen reduction on carbon-supported Pt nanoparticles" in Journal of the Serbian Chemical Society, 73, no. 6 (2008):641-654,
https://doi.org/10.2298/JSC0806641E . .

TY  - JOUR
AU  - Elezović, Nevenka R.
AU  - Babić, Biljana M.
AU  - Radmilović, Velimir R
AU  - Gojković, Snežana Lj
AU  - Krstajić, Nedeljko V
AU  - Vračar, Ljiljana M
PY  - 2008
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/244
AB  - The oxidation of methanol and reduction of oxygen were studied on MoOx-Pt/C nano-catalysts prepared by the polyole method combined by MoOx post-deposition. The catalysts were characterized by TEM and EDX. The presented composition of the electrode is very similar to the nominal ones 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 EDX results and the low mobility of these oxides at corresponding conditions. The electrode catalytic activity in the electrooxidation of methanol and the reduction of oxygen was studied by steady-state voltammetry and cyclic voltammetry. MoOx-Pt/C catalyst exhibits higher catalytic activity than Pt/C for the oxygen reduction. The catalytic effect in oxidation of methanol is achieved only under potentiodynamic conditions, when poisoning species have no enough time to develop fully.
PB  - Elsevier Science Bv, Amsterdam
T2  - Journal of Power Sources
T1  - Pt/C doped by MoOx as the electrocatalyst for oxygen reduction and methanol oxidation
EP  - 255
IS  - 1
SP  - 250
VL  - 175
DO  - 10.1016/j.jpowsour.2007.09.011
ER  - 

@article{
author = "Elezović, Nevenka R. and Babić, Biljana M. and Radmilović, Velimir R and Gojković, Snežana Lj and Krstajić, Nedeljko V and Vračar, Ljiljana M",
year = "2008",
abstract = "The oxidation of methanol and reduction of oxygen were studied on MoOx-Pt/C nano-catalysts prepared by the polyole method combined by MoOx post-deposition. The catalysts were characterized by TEM and EDX. The presented composition of the electrode is very similar to the nominal ones 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 EDX results and the low mobility of these oxides at corresponding conditions. The electrode catalytic activity in the electrooxidation of methanol and the reduction of oxygen was studied by steady-state voltammetry and cyclic voltammetry. MoOx-Pt/C catalyst exhibits higher catalytic activity than Pt/C for the oxygen reduction. The catalytic effect in oxidation of methanol is achieved only under potentiodynamic conditions, when poisoning species have no enough time to develop fully.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Journal of Power Sources",
title = "Pt/C doped by MoOx as the electrocatalyst for oxygen reduction and methanol oxidation",
pages = "255-250",
number = "1",
volume = "175",
doi = "10.1016/j.jpowsour.2007.09.011"
}

Elezović, N. R., Babić, B. M., Radmilović, V. R., Gojković, S. L., Krstajić, N. V.,& Vračar, L. M.. (2008). Pt/C doped by MoOx as the electrocatalyst for oxygen reduction and methanol oxidation. in Journal of Power Sources
Elsevier Science Bv, Amsterdam., 175(1), 250-255.
https://doi.org/10.1016/j.jpowsour.2007.09.011

Elezović NR, Babić BM, Radmilović VR, Gojković SL, Krstajić NV, Vračar LM. Pt/C doped by MoOx as the electrocatalyst for oxygen reduction and methanol oxidation. in Journal of Power Sources. 2008;175(1):250-255.
doi:10.1016/j.jpowsour.2007.09.011 .

Elezović, Nevenka R., Babić, Biljana M., Radmilović, Velimir R, Gojković, Snežana Lj, Krstajić, Nedeljko V, Vračar, Ljiljana M, "Pt/C doped by MoOx as the electrocatalyst for oxygen reduction and methanol oxidation" in Journal of Power Sources, 175, no. 1 (2008):250-255,
https://doi.org/10.1016/j.jpowsour.2007.09.011 . .

TY  - JOUR
AU  - Elezović, Nevenka R.
AU  - Babić, Biljana M.
AU  - Vracar, L. J. M.
AU  - Krstajić, Nedeljko V
PY  - 2007
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/226
AB  - The oxygen reduction reaction was investigated in 0.1 M NaOH solution, on a porous coated electrode formed of Pt particles supported on carbon cryogel. The Pt/C catalyst was characterized by the X-ray diffraction (XRD), transmission electron microscopy (TEM) and cyclic voltammetry techniques. The results demonstrated a successful reduction of Pt to metallic form and homogenous Pt particle size distribution with a mean particle size of about 2.7 nm. The ORR kinetics was investigated by linear sweep polarization at a rotating disc electrode. The results showed the existence of two E - log j regions, usually referred to polycrystalline Pt in acid and alkaline solution. At low Current densities (led), the Tafel slope was found to be close to -2.3RT/F, while at high current densities (bed) it was found to be close to -2x2.3RT/F. It is proposed that the main path in the ORR mechanism on Pt particles was the direct four-electron process, with the transfer of the first electron as the rate determining step. If the activities are expressed through the specific current densities, a small enhancement of the catalytic activity for Pt/C was observed compared to that of polycrystalline Pt. The effect of the Pt particle size on the electrocatalysis of oxygen reduction was ascribed to the predominant (111) facets of the platinum crystallites.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - Oxygen reduction at platinum nanoparticles supported on carbon cryogel in alkaline solution
EP  - 708
IS  - 7
SP  - 699
VL  - 72
DO  - 10.2298/JSC0707699E
ER  - 

@article{
author = "Elezović, Nevenka R. and Babić, Biljana M. and Vracar, L. J. M. and Krstajić, Nedeljko V",
year = "2007",
abstract = "The oxygen reduction reaction was investigated in 0.1 M NaOH solution, on a porous coated electrode formed of Pt particles supported on carbon cryogel. The Pt/C catalyst was characterized by the X-ray diffraction (XRD), transmission electron microscopy (TEM) and cyclic voltammetry techniques. The results demonstrated a successful reduction of Pt to metallic form and homogenous Pt particle size distribution with a mean particle size of about 2.7 nm. The ORR kinetics was investigated by linear sweep polarization at a rotating disc electrode. The results showed the existence of two E - log j regions, usually referred to polycrystalline Pt in acid and alkaline solution. At low Current densities (led), the Tafel slope was found to be close to -2.3RT/F, while at high current densities (bed) it was found to be close to -2x2.3RT/F. It is proposed that the main path in the ORR mechanism on Pt particles was the direct four-electron process, with the transfer of the first electron as the rate determining step. If the activities are expressed through the specific current densities, a small enhancement of the catalytic activity for Pt/C was observed compared to that of polycrystalline Pt. The effect of the Pt particle size on the electrocatalysis of oxygen reduction was ascribed to the predominant (111) facets of the platinum crystallites.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "Oxygen reduction at platinum nanoparticles supported on carbon cryogel in alkaline solution",
pages = "708-699",
number = "7",
volume = "72",
doi = "10.2298/JSC0707699E"
}

Elezović, N. R., Babić, B. M., Vracar, L. J. M.,& Krstajić, N. V.. (2007). Oxygen reduction at platinum nanoparticles supported on carbon cryogel in alkaline solution. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 72(7), 699-708.
https://doi.org/10.2298/JSC0707699E

Elezović NR, Babić BM, Vracar LJM, Krstajić NV. Oxygen reduction at platinum nanoparticles supported on carbon cryogel in alkaline solution. in Journal of the Serbian Chemical Society. 2007;72(7):699-708.
doi:10.2298/JSC0707699E .

Elezović, Nevenka R., Babić, Biljana M., Vracar, L. J. M., Krstajić, Nedeljko V, "Oxygen reduction at platinum nanoparticles supported on carbon cryogel in alkaline solution" in Journal of the Serbian Chemical Society, 72, no. 7 (2007):699-708,
https://doi.org/10.2298/JSC0707699E . .

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 . .

TY  - JOUR
AU  - Vračar, Ljiljana M
AU  - Krstajić, Nedeljko V
AU  - Elezović, Nevenka R.
PY  - 2006
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/156
AB  - The underpotential deposition of hydrogen was studied in 0.5 mol dm(-3) HClO4 solution on an electrode based on Ebonex-supported platinum electrocatalyst spread on rotation Au disk electrode (Ebonex/Pt). Pt catalyst was prepared by the impregnation method from 2-propanol solution of Pt(NH3)(2)(NO2)(2) and Ebonex powder. Ebonex support (nonstoichiometric mixture of titanium oxides) was characterized by: X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX) and BET techniques. The synthesized catalyst was analyzed by TEM technique. Voltammetric profiles at the Ebonex/Pt catalyst surface in 0.5 mol dm(-3) HClO4 aqueous solution obtained at different temperatures with the evaluation of the temperature effect on the reversible adsorption of the H-upd state are presented and the thermodynamic state functions for H adatom adsorption process are calculated. The chemisorptive energy strength of the Ebonex/Pt-H state is estimated in order to establish the relationship between the surface structure and the electrocatalytic activity of Ebonex/Pt electrode and compare it to the one for smooth polycrystalline Pt.
PB  - Trans Tech Publications Ltd
T2  - Materials Science Forum
T1  - Electrocatalytic activity of nano-sized Ebonex/Pt for underpotential deposition of hydrogen
EP  - 258
SP  - 253
VL  - 518
DO  - 10.4028/www.scientific.net/msf.518.253
ER  - 

@article{
author = "Vračar, Ljiljana M and Krstajić, Nedeljko V and Elezović, Nevenka R.",
year = "2006",
abstract = "The underpotential deposition of hydrogen was studied in 0.5 mol dm(-3) HClO4 solution on an electrode based on Ebonex-supported platinum electrocatalyst spread on rotation Au disk electrode (Ebonex/Pt). Pt catalyst was prepared by the impregnation method from 2-propanol solution of Pt(NH3)(2)(NO2)(2) and Ebonex powder. Ebonex support (nonstoichiometric mixture of titanium oxides) was characterized by: X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX) and BET techniques. The synthesized catalyst was analyzed by TEM technique. Voltammetric profiles at the Ebonex/Pt catalyst surface in 0.5 mol dm(-3) HClO4 aqueous solution obtained at different temperatures with the evaluation of the temperature effect on the reversible adsorption of the H-upd state are presented and the thermodynamic state functions for H adatom adsorption process are calculated. The chemisorptive energy strength of the Ebonex/Pt-H state is estimated in order to establish the relationship between the surface structure and the electrocatalytic activity of Ebonex/Pt electrode and compare it to the one for smooth polycrystalline Pt.",
publisher = "Trans Tech Publications Ltd",
journal = "Materials Science Forum",
title = "Electrocatalytic activity of nano-sized Ebonex/Pt for underpotential deposition of hydrogen",
pages = "258-253",
volume = "518",
doi = "10.4028/www.scientific.net/msf.518.253"
}

Vračar, L. M., Krstajić, N. V.,& Elezović, N. R.. (2006). Electrocatalytic activity of nano-sized Ebonex/Pt for underpotential deposition of hydrogen. in Materials Science Forum
Trans Tech Publications Ltd., 518, 253-258.
https://doi.org/10.4028/www.scientific.net/msf.518.253

Vračar LM, Krstajić NV, Elezović NR. Electrocatalytic activity of nano-sized Ebonex/Pt for underpotential deposition of hydrogen. in Materials Science Forum. 2006;518:253-258.
doi:10.4028/www.scientific.net/msf.518.253 .

Vračar, Ljiljana M, Krstajić, Nedeljko V, Elezović, Nevenka R., "Electrocatalytic activity of nano-sized Ebonex/Pt for underpotential deposition of hydrogen" in Materials Science Forum, 518 (2006):253-258,
https://doi.org/10.4028/www.scientific.net/msf.518.253 . .

TY  - JOUR
AU  - Vračar, Ljiljana M
AU  - Gojković, Snežana Lj
AU  - Elezović, Nevenka R.
AU  - Radmilović, Velimir R
AU  - Jakšić, M.M.
AU  - Krstajić, Nedeljko V
PY  - 2006
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/158
AB  - The impregnation method has been applied to synthesize platinum nanoparticles on Magneli phase titanium oxide powder (Ebonex). Surface area of the Ebonex support was determined by BET technique. Distribution and morphology of Pt nanoparticles in Ebonex/Pt catalyst were analyzed by TEM and HRTEM technique. Rather uniformly dispersed, Pt particles Of 5 +/- 3 nm were observed. The catalyst was tested for oxygen reduction and methanol oxidation in alkaline solution. It was found that in whole potential range oxygen was reduced with four electron exchanged and that the transfer of the first electron was the rate determining step. The kinetics of oxygen reduction on Ebonex/Pt can be described by the same equations as on polycrystalline Pt. When the activities were expressed through the specific current densities, no enhancement for Ebonex/Pt was observed comparing with polycrystalline Pt. Kinetic parameters and specific activity of the methanol oxidation on Ebonex/Pt,was found to be similar to those on polycrystalline Pt as well as to literature data for Pt nanoparticles on other supporting,materials. The Results: for, both reactions investigated indicate that Ebonex does not increase the activity of Pt significantly, bat can serve as a suitable supporting material for nanoparticles in fuel cell catalysts.
T2  - Journal of New Materials for Electrochemical Systems
T1  - Magneli phase titanium oxides as catalyst support - Electrochemical behavior of Ebonex/Pt catalysts
EP  - 106
IS  - 2
SP  - 99
VL  - 9
UR  - https://hdl.handle.net/21.15107/rcub_technorep_871
ER  - 

@article{
author = "Vračar, Ljiljana M and Gojković, Snežana Lj and Elezović, Nevenka R. and Radmilović, Velimir R and Jakšić, M.M. and Krstajić, Nedeljko V",
year = "2006",
abstract = "The impregnation method has been applied to synthesize platinum nanoparticles on Magneli phase titanium oxide powder (Ebonex). Surface area of the Ebonex support was determined by BET technique. Distribution and morphology of Pt nanoparticles in Ebonex/Pt catalyst were analyzed by TEM and HRTEM technique. Rather uniformly dispersed, Pt particles Of 5 +/- 3 nm were observed. The catalyst was tested for oxygen reduction and methanol oxidation in alkaline solution. It was found that in whole potential range oxygen was reduced with four electron exchanged and that the transfer of the first electron was the rate determining step. The kinetics of oxygen reduction on Ebonex/Pt can be described by the same equations as on polycrystalline Pt. When the activities were expressed through the specific current densities, no enhancement for Ebonex/Pt was observed comparing with polycrystalline Pt. Kinetic parameters and specific activity of the methanol oxidation on Ebonex/Pt,was found to be similar to those on polycrystalline Pt as well as to literature data for Pt nanoparticles on other supporting,materials. The Results: for, both reactions investigated indicate that Ebonex does not increase the activity of Pt significantly, bat can serve as a suitable supporting material for nanoparticles in fuel cell catalysts.",
journal = "Journal of New Materials for Electrochemical Systems",
title = "Magneli phase titanium oxides as catalyst support - Electrochemical behavior of Ebonex/Pt catalysts",
pages = "106-99",
number = "2",
volume = "9",
url = "https://hdl.handle.net/21.15107/rcub_technorep_871"
}

Vračar, L. M., Gojković, S. L., Elezović, N. R., Radmilović, V. R., Jakšić, M.M.,& Krstajić, N. V.. (2006). Magneli phase titanium oxides as catalyst support - Electrochemical behavior of Ebonex/Pt catalysts. in Journal of New Materials for Electrochemical Systems, 9(2), 99-106.
https://hdl.handle.net/21.15107/rcub_technorep_871

Vračar LM, Gojković SL, Elezović NR, Radmilović VR, Jakšić M, Krstajić NV. Magneli phase titanium oxides as catalyst support - Electrochemical behavior of Ebonex/Pt catalysts. in Journal of New Materials for Electrochemical Systems. 2006;9(2):99-106.
https://hdl.handle.net/21.15107/rcub_technorep_871 .

Vračar, Ljiljana M, Gojković, Snežana Lj, Elezović, Nevenka R., Radmilović, Velimir R, Jakšić, M.M., Krstajić, Nedeljko V, "Magneli phase titanium oxides as catalyst support - Electrochemical behavior of Ebonex/Pt catalysts" in Journal of New Materials for Electrochemical Systems, 9, no. 2 (2006):99-106,
https://hdl.handle.net/21.15107/rcub_technorep_871 .