Gojković, Snežana Lj

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  • Gojković, Snežana Lj (9)
  • Gojković, Snežana Lj. (1)
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Author's Bibliography

Palladium-copper bimetallic surfaces as electrocatalysts for the ethanol oxidation in an alkaline medium

Obradović, Maja; Lačnjevac, Uroš; Radmilovic, Vuk; Gavrilović-Wohlmuther, Aleksandra; Kovač, Janez; Rogan, Jelena R.; Radmilović, Velimir R.; Gojković, Snežana Lj.

(Elsevier B.V., 2023)

TY  - JOUR
AU  - Obradović, Maja
AU  - Lačnjevac, Uroš
AU  - Radmilovic, Vuk
AU  - Gavrilović-Wohlmuther, Aleksandra
AU  - Kovač, Janez
AU  - Rogan, Jelena R.
AU  - Radmilović, Velimir R.
AU  - Gojković, Snežana Lj.
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2782
AB  - Two types of Cu-modified Pd catalysts supported on high area carbon were prepared: Pd nanoparticles modified
with a sub-monolayer of underpotentially deposited Cu (Cu@Pd/C) and Pd-Cu alloy nanoparticles (Pd-Cu/C),
and examined for the ethanol oxidation reaction (EOR) in alkaline solution. The catalysts were characterized by
energy-dispersive X-ray spectroscopy, X-ray diffraction, transmission electron microscopy and X-ray photoelectron
spectroscopy, as well as cyclic voltammetry. As reference catalysts, Pd/C and Pt/C were used. The electrochemically
active surface area of all samples was determined from COads and Cuupd desorption and Pd oxide
reduction, and used to assess their intrinsic activity for EOR. Intimate contact of Pd with Cu atoms enhanced its
activity, regardless of the type of bimetal catalyst. The atomic Pd:Cu ratio between 2:1 and 4:1 appears to be
optimal for high activity. The most active catalyst under the potentiodynamic conditions was Cu@Pd/C with
θ(Cu) = 0.21,although Pd-Cu/C was superior during the potentiostatic test. All bimetallic catalysts surpassed
Pd/C in mass activity. The EOR activity of Pt/C was higher compared to Pd-based catalysts at low potentials,
both in terms of specific and mass activity, but with a significant decline over a 30-min potentiostatic stability
test.
PB  - Elsevier B.V.
T2  - Journal of Electroanalytical Chemistry
T1  - Palladium-copper bimetallic surfaces as electrocatalysts for the ethanol oxidation in an alkaline medium
SP  - 117673
VL  - 944
DO  - 10.1016/j.jelechem.2023.117673
ER  - 
@article{
author = "Obradović, Maja and Lačnjevac, Uroš and Radmilovic, Vuk and Gavrilović-Wohlmuther, Aleksandra and Kovač, Janez and Rogan, Jelena R. and Radmilović, Velimir R. and Gojković, Snežana Lj.",
year = "2023",
abstract = "Two types of Cu-modified Pd catalysts supported on high area carbon were prepared: Pd nanoparticles modified
with a sub-monolayer of underpotentially deposited Cu (Cu@Pd/C) and Pd-Cu alloy nanoparticles (Pd-Cu/C),
and examined for the ethanol oxidation reaction (EOR) in alkaline solution. The catalysts were characterized by
energy-dispersive X-ray spectroscopy, X-ray diffraction, transmission electron microscopy and X-ray photoelectron
spectroscopy, as well as cyclic voltammetry. As reference catalysts, Pd/C and Pt/C were used. The electrochemically
active surface area of all samples was determined from COads and Cuupd desorption and Pd oxide
reduction, and used to assess their intrinsic activity for EOR. Intimate contact of Pd with Cu atoms enhanced its
activity, regardless of the type of bimetal catalyst. The atomic Pd:Cu ratio between 2:1 and 4:1 appears to be
optimal for high activity. The most active catalyst under the potentiodynamic conditions was Cu@Pd/C with
θ(Cu) = 0.21,although Pd-Cu/C was superior during the potentiostatic test. All bimetallic catalysts surpassed
Pd/C in mass activity. The EOR activity of Pt/C was higher compared to Pd-based catalysts at low potentials,
both in terms of specific and mass activity, but with a significant decline over a 30-min potentiostatic stability
test.",
publisher = "Elsevier B.V.",
journal = "Journal of Electroanalytical Chemistry",
title = "Palladium-copper bimetallic surfaces as electrocatalysts for the ethanol oxidation in an alkaline medium",
pages = "117673",
volume = "944",
doi = "10.1016/j.jelechem.2023.117673"
}
Obradović, M., Lačnjevac, U., Radmilovic, V., Gavrilović-Wohlmuther, A., Kovač, J., Rogan, J. R., Radmilović, V. R.,& Gojković, S. Lj.. (2023). Palladium-copper bimetallic surfaces as electrocatalysts for the ethanol oxidation in an alkaline medium. in Journal of Electroanalytical Chemistry
Elsevier B.V.., 944, 117673.
https://doi.org/10.1016/j.jelechem.2023.117673
Obradović M, Lačnjevac U, Radmilovic V, Gavrilović-Wohlmuther A, Kovač J, Rogan JR, Radmilović VR, Gojković SL. Palladium-copper bimetallic surfaces as electrocatalysts for the ethanol oxidation in an alkaline medium. in Journal of Electroanalytical Chemistry. 2023;944:117673.
doi:10.1016/j.jelechem.2023.117673 .
Obradović, Maja, Lačnjevac, Uroš, Radmilovic, Vuk, Gavrilović-Wohlmuther, Aleksandra, Kovač, Janez, Rogan, Jelena R., Radmilović, Velimir R., Gojković, Snežana Lj., "Palladium-copper bimetallic surfaces as electrocatalysts for the ethanol oxidation in an alkaline medium" in Journal of Electroanalytical Chemistry, 944 (2023):117673,
https://doi.org/10.1016/j.jelechem.2023.117673 . .
3

Electrochemically deposited iridium-oxide: Estimation of intrinsic activity and stability in oxygen evolution in acid solution

Obradović, Maja D; Balanc, Bojana D.; Lačnjevac, Uroš; Gojković, Snežana Lj

(Elsevier Science Sa, Lausanne, 2021)

TY  - JOUR
AU  - Obradović, Maja D
AU  - Balanc, Bojana D.
AU  - Lačnjevac, Uroš
AU  - Gojković, Snežana Lj
PY  - 2021
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1458
AB  - Hydrated iridiumoxyhydroxide (IrOx) films were electrochemically deposited from an alkaline oxalic solution at constant anodic potentials and by applying a potential cycling protocol, in both cases with variation of the electrodeposition time. FromUV-vis spetroscopy of the solution for the deposition and their characterization it was concluded that a mixture of Ir(III)/Ir(IV) monomers participates in the deposition of IrOx film. X-ray photoelectron spectroscopy (XPS) of IrOx films indicated that both types of films contained hydrated Ir(IV) hydroxide as the dominant species, but in the film deposited by potential cycling the presence of the additional Ir(III) species was evident. The scanning electon microscopy (SEM) analysis of the surface morphology revealed that films deposited by potential cycling were more uniform than the films deposited at a constant potential. The amount of electrochemically active Ir-species on the surface of deposited IrOx films was estimated from the voltammetric charge of the Ir(III)/Ir(IV) transition. Depending on the film electrodeposition parameters, the values between 15 and 1080 nmol cm-2 were obtained. The electrochemically active surface area (ECSA) of IrOx films was calculated from cyclic voltammetry and electrochemical impedance spectroscopy (EIS) measurements and ranged from 3 to 131 cm(2) per 1 cm(2) of geometric surface area for various films. The activity and stability of IrOx films toward oxygen evolution reaction (OER) was investigated in 0.5 M H2SO4 solution under potentiostatic conditions. The intrinsic activity, stated as turnover frequency and specific current density normalized per ECSA, showed that the OER activity of IrOx films deposited by potential cycling are up to two and a half times higher than the activity of films deposited at a constant anodic potential. Potentiostatic stability test showed a decrease in OER current over time for both type of the films. Determination of ECSA, the amount of electroactive Ir species, XPS spectrum and SEM imaging after the test indicated that the decrease in OER activity was caused by partial dissolution and delamination of the film as well as by oxidation of highly active hydroxide Ir(III) species.
PB  - Elsevier Science Sa, Lausanne
T2  - Journal of Electroanalytical Chemistry
T1  - Electrochemically deposited iridium-oxide: Estimation of intrinsic activity and stability in oxygen evolution in acid solution
VL  - 881
DO  - 10.1016/j.jelechem.2020.114944
ER  - 
@article{
author = "Obradović, Maja D and Balanc, Bojana D. and Lačnjevac, Uroš and Gojković, Snežana Lj",
year = "2021",
abstract = "Hydrated iridiumoxyhydroxide (IrOx) films were electrochemically deposited from an alkaline oxalic solution at constant anodic potentials and by applying a potential cycling protocol, in both cases with variation of the electrodeposition time. FromUV-vis spetroscopy of the solution for the deposition and their characterization it was concluded that a mixture of Ir(III)/Ir(IV) monomers participates in the deposition of IrOx film. X-ray photoelectron spectroscopy (XPS) of IrOx films indicated that both types of films contained hydrated Ir(IV) hydroxide as the dominant species, but in the film deposited by potential cycling the presence of the additional Ir(III) species was evident. The scanning electon microscopy (SEM) analysis of the surface morphology revealed that films deposited by potential cycling were more uniform than the films deposited at a constant potential. The amount of electrochemically active Ir-species on the surface of deposited IrOx films was estimated from the voltammetric charge of the Ir(III)/Ir(IV) transition. Depending on the film electrodeposition parameters, the values between 15 and 1080 nmol cm-2 were obtained. The electrochemically active surface area (ECSA) of IrOx films was calculated from cyclic voltammetry and electrochemical impedance spectroscopy (EIS) measurements and ranged from 3 to 131 cm(2) per 1 cm(2) of geometric surface area for various films. The activity and stability of IrOx films toward oxygen evolution reaction (OER) was investigated in 0.5 M H2SO4 solution under potentiostatic conditions. The intrinsic activity, stated as turnover frequency and specific current density normalized per ECSA, showed that the OER activity of IrOx films deposited by potential cycling are up to two and a half times higher than the activity of films deposited at a constant anodic potential. Potentiostatic stability test showed a decrease in OER current over time for both type of the films. Determination of ECSA, the amount of electroactive Ir species, XPS spectrum and SEM imaging after the test indicated that the decrease in OER activity was caused by partial dissolution and delamination of the film as well as by oxidation of highly active hydroxide Ir(III) species.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Journal of Electroanalytical Chemistry",
title = "Electrochemically deposited iridium-oxide: Estimation of intrinsic activity and stability in oxygen evolution in acid solution",
volume = "881",
doi = "10.1016/j.jelechem.2020.114944"
}
Obradović, M. D., Balanc, B. D., Lačnjevac, U.,& Gojković, S. L.. (2021). Electrochemically deposited iridium-oxide: Estimation of intrinsic activity and stability in oxygen evolution in acid solution. in Journal of Electroanalytical Chemistry
Elsevier Science Sa, Lausanne., 881.
https://doi.org/10.1016/j.jelechem.2020.114944
Obradović MD, Balanc BD, Lačnjevac U, Gojković SL. Electrochemically deposited iridium-oxide: Estimation of intrinsic activity and stability in oxygen evolution in acid solution. in Journal of Electroanalytical Chemistry. 2021;881.
doi:10.1016/j.jelechem.2020.114944 .
Obradović, Maja D, Balanc, Bojana D., Lačnjevac, Uroš, Gojković, Snežana Lj, "Electrochemically deposited iridium-oxide: Estimation of intrinsic activity and stability in oxygen evolution in acid solution" in Journal of Electroanalytical Chemistry, 881 (2021),
https://doi.org/10.1016/j.jelechem.2020.114944 . .
23
1
20

Dispersion effect in formic acid oxidation on PtAu/C nanocatalyst prepared by water-in-oil microemulsion method

Krstajic-Pajic, M. N.; Stevanović, Sanja I.; Radmilović, Velimir R; Gavrilovic-Wohlmuther, Aleksandra; Zabinski, P.; Elezović, Nevenka R.; Radmilović, Vuk V.; Gojković, Snežana Lj; Jovanović, V. M.

(Elsevier Science Bv, Amsterdam, 2019)

TY  - JOUR
AU  - Krstajic-Pajic, M. N.
AU  - Stevanović, Sanja I.
AU  - Radmilović, Velimir R
AU  - Gavrilovic-Wohlmuther, Aleksandra
AU  - Zabinski, P.
AU  - Elezović, Nevenka R.
AU  - Radmilović, Vuk V.
AU  - Gojković, Snežana Lj
AU  - Jovanović, V. M.
PY  - 2019
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1218
AB  - Low loading PtAu nanoparticles supported on high area carbon were synthesized by water-in-oil microemulsion method and examined for formic acid and methanol oxidation. Prepared catalyst powder was characterized by Xray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). These techniques revealed that the catalyst contains rather agglomerated quasi-spherical particles, similar to 4 nm diameter, composed of a solid solution of Pt and Au with only similar to 4 at% of Au. In spite of such low Au content, both onset and peak potentials for CO oxidation are shifted some 150 mV to more positive values in comparison to Pt synthesized in the same manner due to stronger binding of CO as a result of notable electronic effect. It is important that this small quantity of Au also significantly influences oxidation of formic acid promoting direct path and suppressing indirect path in formic acid oxidation in a degree as expected by a much larger quantity of Au. Such improvement could be due exclusively by ensemble effect of high number of small Pt domains which formation could be possible only by very fine dispersion of such low Au quantity. High number of small Pt domains is corroborated by lower activity for methanol oxidation in comparison to Pt catalyst synthesized by the same procedure. These results emphasize the importance of the Au dispersion on the surface of Pt over its quantity in PtAu catalyst with regards to both, the ensemble and the electronic effects.
PB  - Elsevier Science Bv, Amsterdam
T2  - Applied Catalysis B-Environmental
T1  - Dispersion effect in formic acid oxidation on PtAu/C nanocatalyst prepared by water-in-oil microemulsion method
EP  - 593
SP  - 585
VL  - 243
DO  - 10.1016/j.apcatb.2018.10.064
ER  - 
@article{
author = "Krstajic-Pajic, M. N. and Stevanović, Sanja I. and Radmilović, Velimir R and Gavrilovic-Wohlmuther, Aleksandra and Zabinski, P. and Elezović, Nevenka R. and Radmilović, Vuk V. and Gojković, Snežana Lj and Jovanović, V. M.",
year = "2019",
abstract = "Low loading PtAu nanoparticles supported on high area carbon were synthesized by water-in-oil microemulsion method and examined for formic acid and methanol oxidation. Prepared catalyst powder was characterized by Xray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). These techniques revealed that the catalyst contains rather agglomerated quasi-spherical particles, similar to 4 nm diameter, composed of a solid solution of Pt and Au with only similar to 4 at% of Au. In spite of such low Au content, both onset and peak potentials for CO oxidation are shifted some 150 mV to more positive values in comparison to Pt synthesized in the same manner due to stronger binding of CO as a result of notable electronic effect. It is important that this small quantity of Au also significantly influences oxidation of formic acid promoting direct path and suppressing indirect path in formic acid oxidation in a degree as expected by a much larger quantity of Au. Such improvement could be due exclusively by ensemble effect of high number of small Pt domains which formation could be possible only by very fine dispersion of such low Au quantity. High number of small Pt domains is corroborated by lower activity for methanol oxidation in comparison to Pt catalyst synthesized by the same procedure. These results emphasize the importance of the Au dispersion on the surface of Pt over its quantity in PtAu catalyst with regards to both, the ensemble and the electronic effects.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Applied Catalysis B-Environmental",
title = "Dispersion effect in formic acid oxidation on PtAu/C nanocatalyst prepared by water-in-oil microemulsion method",
pages = "593-585",
volume = "243",
doi = "10.1016/j.apcatb.2018.10.064"
}
Krstajic-Pajic, M. N., Stevanović, S. I., Radmilović, V. R., Gavrilovic-Wohlmuther, A., Zabinski, P., Elezović, N. R., Radmilović, V. V., Gojković, S. L.,& Jovanović, V. M.. (2019). Dispersion effect in formic acid oxidation on PtAu/C nanocatalyst prepared by water-in-oil microemulsion method. in Applied Catalysis B-Environmental
Elsevier Science Bv, Amsterdam., 243, 585-593.
https://doi.org/10.1016/j.apcatb.2018.10.064
Krstajic-Pajic MN, Stevanović SI, Radmilović VR, Gavrilovic-Wohlmuther A, Zabinski P, Elezović NR, Radmilović VV, Gojković SL, Jovanović VM. Dispersion effect in formic acid oxidation on PtAu/C nanocatalyst prepared by water-in-oil microemulsion method. in Applied Catalysis B-Environmental. 2019;243:585-593.
doi:10.1016/j.apcatb.2018.10.064 .
Krstajic-Pajic, M. N., Stevanović, Sanja I., Radmilović, Velimir R, Gavrilovic-Wohlmuther, Aleksandra, Zabinski, P., Elezović, Nevenka R., Radmilović, Vuk V., Gojković, Snežana Lj, Jovanović, V. M., "Dispersion effect in formic acid oxidation on PtAu/C nanocatalyst prepared by water-in-oil microemulsion method" in Applied Catalysis B-Environmental, 243 (2019):585-593,
https://doi.org/10.1016/j.apcatb.2018.10.064 . .
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40

Electrochemical oxidation of ethanol on palladium-nickel nanocatalyst in alkaline media

Obradovitc, M. D.; Stancic, Z. M.; Lačnjevac, Uroš; Radmilović, Velimir R; Gavrilovic-Wohlmuther, Aleksandra; Radmilović, Vuk V.; Gojković, Snežana Lj

(Elsevier, Amsterdam, 2016)

TY  - JOUR
AU  - Obradovitc, M. D.
AU  - Stancic, Z. M.
AU  - Lačnjevac, Uroš
AU  - Radmilović, Velimir R
AU  - Gavrilovic-Wohlmuther, Aleksandra
AU  - Radmilović, Vuk V.
AU  - Gojković, Snežana Lj
PY  - 2016
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1012
AB  - Pd-Ni/C catalyst was synthesized employing a borohydride reduction method. The high area Ni was first dispersed on the carbon support and then modified by Pd nanoparticles. Transmission electron microscopy confirmed relatively even distribution of Ni across the carbon support with discrete palladium particles of about 3.3 nm mean diameter on it. Cyclic voltammetry confirmed the presence of Ni on the catalyst surface. The activity of the Pd-Ni/C catalysts for ethanol oxidation reaction (EOR) in alkaline solution was tested under the potentiodynamic and potentiostatic conditions and the results were compared to those obtained on the Pd/C catalyst. It was found that Pd-Ni/C is more active for the EOR compared to Pd/C by a factor up to 3, depending on the type of experiments and whether specific activity or mass activity are considered. During the potentiodynamic stability test an interesting phenomenon of activation of Pd-Ni/C catalyst was observed. It was found that maximum activity is attained after fifty cycles with the positive potential limit of 1.2 V, regardless of whether they were performed in the electrolyte with or without ethanol. It was postulated that potential cycling of the Pd-Ni surface causes reorganization of the catalyst surface bringing Pd and Ni sites to a more suitable arrangement for the efficient ethanol oxidation.
PB  - Elsevier, Amsterdam
T2  - Applied Catalysis B-Environmental
T1  - Electrochemical oxidation of ethanol on palladium-nickel nanocatalyst in alkaline media
EP  - 118
SP  - 110
VL  - 189
DO  - 10.1016/j.apcatb.2016.02.039
ER  - 
@article{
author = "Obradovitc, M. D. and Stancic, Z. M. and Lačnjevac, Uroš and Radmilović, Velimir R and Gavrilovic-Wohlmuther, Aleksandra and Radmilović, Vuk V. and Gojković, Snežana Lj",
year = "2016",
abstract = "Pd-Ni/C catalyst was synthesized employing a borohydride reduction method. The high area Ni was first dispersed on the carbon support and then modified by Pd nanoparticles. Transmission electron microscopy confirmed relatively even distribution of Ni across the carbon support with discrete palladium particles of about 3.3 nm mean diameter on it. Cyclic voltammetry confirmed the presence of Ni on the catalyst surface. The activity of the Pd-Ni/C catalysts for ethanol oxidation reaction (EOR) in alkaline solution was tested under the potentiodynamic and potentiostatic conditions and the results were compared to those obtained on the Pd/C catalyst. It was found that Pd-Ni/C is more active for the EOR compared to Pd/C by a factor up to 3, depending on the type of experiments and whether specific activity or mass activity are considered. During the potentiodynamic stability test an interesting phenomenon of activation of Pd-Ni/C catalyst was observed. It was found that maximum activity is attained after fifty cycles with the positive potential limit of 1.2 V, regardless of whether they were performed in the electrolyte with or without ethanol. It was postulated that potential cycling of the Pd-Ni surface causes reorganization of the catalyst surface bringing Pd and Ni sites to a more suitable arrangement for the efficient ethanol oxidation.",
publisher = "Elsevier, Amsterdam",
journal = "Applied Catalysis B-Environmental",
title = "Electrochemical oxidation of ethanol on palladium-nickel nanocatalyst in alkaline media",
pages = "118-110",
volume = "189",
doi = "10.1016/j.apcatb.2016.02.039"
}
Obradovitc, M. D., Stancic, Z. M., Lačnjevac, U., Radmilović, V. R., Gavrilovic-Wohlmuther, A., Radmilović, V. V.,& Gojković, S. L.. (2016). Electrochemical oxidation of ethanol on palladium-nickel nanocatalyst in alkaline media. in Applied Catalysis B-Environmental
Elsevier, Amsterdam., 189, 110-118.
https://doi.org/10.1016/j.apcatb.2016.02.039
Obradovitc MD, Stancic ZM, Lačnjevac U, Radmilović VR, Gavrilovic-Wohlmuther A, Radmilović VV, Gojković SL. Electrochemical oxidation of ethanol on palladium-nickel nanocatalyst in alkaline media. in Applied Catalysis B-Environmental. 2016;189:110-118.
doi:10.1016/j.apcatb.2016.02.039 .
Obradovitc, M. D., Stancic, Z. M., Lačnjevac, Uroš, Radmilović, Velimir R, Gavrilovic-Wohlmuther, Aleksandra, Radmilović, Vuk V., Gojković, Snežana Lj, "Electrochemical oxidation of ethanol on palladium-nickel nanocatalyst in alkaline media" in Applied Catalysis B-Environmental, 189 (2016):110-118,
https://doi.org/10.1016/j.apcatb.2016.02.039 . .
1
100
71
93

RuxTi1-xO2 as the support for Pt nanoparticles: Electrocatalysis of methanol oxidation

Obradović, Maja D; Lačnjevac, Uroš; Babić, Biljana M.; Ercius, P.; Radmilović, Velimir R; Krstajić, Nedeljko V; Gojković, Snežana Lj

(Amsterdam : Elsevier, 2015)

TY  - JOUR
AU  - Obradović, Maja D
AU  - Lačnjevac, Uroš
AU  - Babić, Biljana M.
AU  - Ercius, P.
AU  - Radmilović, Velimir R
AU  - Krstajić, Nedeljko V
AU  - Gojković, Snežana Lj
PY  - 2015
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/856
AB  - Two binary Ru-Ti oxides, Rum Ti0.9O2 and Ru0.7Ti0.3O2, were synthesized by the sol-gel method and used as an electrocatalyst support. The system was characterized by XRD, EDS, TEM and cyclic voltammetry. The Rum Ti0.9O2 and Ru0.7Ti0.3O2 consist of two phases of anatase and rutile structure. An average size of the Pt nanoparticles supported on them is similar to 3.5 nm and they are deposited on both Ru and Ti-rich domains. The supports exhibited good conductivity and electrochemical stability. The onset potentials of COads oxidation on the synthesized catalysts and on commercial PtRu/C are similar to each other and lower than that on Pt/C. This suggests that in Pt/Rum Ti0.9O2 and Pt/Ru0(.7)Ti(0.3)O(2) the Pt nanoparticles are in close contact with Ru atoms from the support, which enables the bifunctional mechanism. The activity and stability of the catalysts for methanol oxidation were examined under potentiodynamic and potentiostatic conditions. While the activity of Pt/Rum Ti0.9O2 is unsatisfactory, the performance of Pt/Ru0.7Ti0.3O2 is comparable to PtRu/C. For example, in the potentiostatic test at 0.5 V the activities after 25 min are 0.035 mA cm(-2) and 0.022 mA cm(-2) for Pt/Ru0.7Ti0.3O2 and PtRu/C, respectively. In potentiodynamic test the activities at 0.5V after 250 cycles are around 0.02 mA cm(-2) for both catalysts.
PB  - Amsterdam : Elsevier
T2  - Applied Catalysis B-Environmental
T1  - RuxTi1-xO2 as the support for Pt nanoparticles: Electrocatalysis of methanol oxidation
EP  - 152
SP  - 144
VL  - 170
DO  - 10.1016/j.apcatb.2015.01.038
ER  - 
@article{
author = "Obradović, Maja D and Lačnjevac, Uroš and Babić, Biljana M. and Ercius, P. and Radmilović, Velimir R and Krstajić, Nedeljko V and Gojković, Snežana Lj",
year = "2015",
abstract = "Two binary Ru-Ti oxides, Rum Ti0.9O2 and Ru0.7Ti0.3O2, were synthesized by the sol-gel method and used as an electrocatalyst support. The system was characterized by XRD, EDS, TEM and cyclic voltammetry. The Rum Ti0.9O2 and Ru0.7Ti0.3O2 consist of two phases of anatase and rutile structure. An average size of the Pt nanoparticles supported on them is similar to 3.5 nm and they are deposited on both Ru and Ti-rich domains. The supports exhibited good conductivity and electrochemical stability. The onset potentials of COads oxidation on the synthesized catalysts and on commercial PtRu/C are similar to each other and lower than that on Pt/C. This suggests that in Pt/Rum Ti0.9O2 and Pt/Ru0(.7)Ti(0.3)O(2) the Pt nanoparticles are in close contact with Ru atoms from the support, which enables the bifunctional mechanism. The activity and stability of the catalysts for methanol oxidation were examined under potentiodynamic and potentiostatic conditions. While the activity of Pt/Rum Ti0.9O2 is unsatisfactory, the performance of Pt/Ru0.7Ti0.3O2 is comparable to PtRu/C. For example, in the potentiostatic test at 0.5 V the activities after 25 min are 0.035 mA cm(-2) and 0.022 mA cm(-2) for Pt/Ru0.7Ti0.3O2 and PtRu/C, respectively. In potentiodynamic test the activities at 0.5V after 250 cycles are around 0.02 mA cm(-2) for both catalysts.",
publisher = "Amsterdam : Elsevier",
journal = "Applied Catalysis B-Environmental",
title = "RuxTi1-xO2 as the support for Pt nanoparticles: Electrocatalysis of methanol oxidation",
pages = "152-144",
volume = "170",
doi = "10.1016/j.apcatb.2015.01.038"
}
Obradović, M. D., Lačnjevac, U., Babić, B. M., Ercius, P., Radmilović, V. R., Krstajić, N. V.,& Gojković, S. L.. (2015). RuxTi1-xO2 as the support for Pt nanoparticles: Electrocatalysis of methanol oxidation. in Applied Catalysis B-Environmental
Amsterdam : Elsevier., 170, 144-152.
https://doi.org/10.1016/j.apcatb.2015.01.038
Obradović MD, Lačnjevac U, Babić BM, Ercius P, Radmilović VR, Krstajić NV, Gojković SL. RuxTi1-xO2 as the support for Pt nanoparticles: Electrocatalysis of methanol oxidation. in Applied Catalysis B-Environmental. 2015;170:144-152.
doi:10.1016/j.apcatb.2015.01.038 .
Obradović, Maja D, Lačnjevac, Uroš, Babić, Biljana M., Ercius, P., Radmilović, Velimir R, Krstajić, Nedeljko V, Gojković, Snežana Lj, "RuxTi1-xO2 as the support for Pt nanoparticles: Electrocatalysis of methanol oxidation" in Applied Catalysis B-Environmental, 170 (2015):144-152,
https://doi.org/10.1016/j.apcatb.2015.01.038 . .
25
20
23

Electrochemical oxidation of methanol on Pt/(RuxSn1-x)O-2 nanocatalyst

Krstajic, Mila N; Obradović, Maja D; Babić, Biljana M.; Radmilović, Velimir R; Lačnjevac, Uroš; Krstajić, Nedeljko V; Gojković, Snežana Lj

(Srpsko hemijsko društvo, Beograd, 2013)

TY  - JOUR
AU  - Krstajic, Mila N
AU  - Obradović, Maja D
AU  - Babić, Biljana M.
AU  - Radmilović, Velimir R
AU  - Lačnjevac, Uroš
AU  - Krstajić, Nedeljko V
AU  - Gojković, Snežana Lj
PY  - 2013
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/640
AB  - Ru-doped SnO2 powder, (RuxSn1-x)O-2, with a Sn:Ru atomic ratio of 9:1 was synthesized and used as a support for Pt nanoparticles (30 mass % loading). The (RuxSn1-x)O-2 support and the Pt/(RuxSn1-x)O-2 catalyst were characterized by X-ray diffraction measurements, energy dispersive X-ray spectroscopy and transmission electron microscopy (TEM). The (RuxSn1-x)O-2 was found to be a two-phase material consisting of probably a solid solution of RuO2 in SnO2 and pure RuO2. The average Pt particle size determined by TEM was 5.3 nm. Cyclic voltammetry of Pt/(RuxSn1-x)O-2 indicated good conductivity of the support and displayed the usual features of Pt. The results of the electrochemical oxidation of COad, and methanol on Pt/(RuxSn1-x)O-2 were compared with those on commercial Pt/C and PtRu/C catalysts. Oxidation of COads on Pt/(RuxSn1-x)O-2 starts at lower positive potentials than on PtRu/C and Pt/C. Potentiodynamic polarization curves and chronoamperometric curves of methanol oxidation indicated higher initial activity of the Pt/(RuxSn1-x)O-2 catalyst compared to PtRu/C, but also a greater loss in current density over time. A potentiodynamic stability test of the catalysts revealed that deactivation of Pt/(RuxSn1-x)O-2 and Pt/C was primarily caused by poisoning of the Pt surface by residues of methanol oxidation, which mostly occurred during the first potential cycle. In the case of PtRu/C, the poisoning of the surface was minor and deactivation was caused by surface area loss of the PtRu.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - Electrochemical oxidation of methanol on Pt/(RuxSn1-x)O-2 nanocatalyst
EP  - 1716
IS  - 11
SP  - 1703
VL  - 78
DO  - 10.2298/JSC130718091K
ER  - 
@article{
author = "Krstajic, Mila N and Obradović, Maja D and Babić, Biljana M. and Radmilović, Velimir R and Lačnjevac, Uroš and Krstajić, Nedeljko V and Gojković, Snežana Lj",
year = "2013",
abstract = "Ru-doped SnO2 powder, (RuxSn1-x)O-2, with a Sn:Ru atomic ratio of 9:1 was synthesized and used as a support for Pt nanoparticles (30 mass % loading). The (RuxSn1-x)O-2 support and the Pt/(RuxSn1-x)O-2 catalyst were characterized by X-ray diffraction measurements, energy dispersive X-ray spectroscopy and transmission electron microscopy (TEM). The (RuxSn1-x)O-2 was found to be a two-phase material consisting of probably a solid solution of RuO2 in SnO2 and pure RuO2. The average Pt particle size determined by TEM was 5.3 nm. Cyclic voltammetry of Pt/(RuxSn1-x)O-2 indicated good conductivity of the support and displayed the usual features of Pt. The results of the electrochemical oxidation of COad, and methanol on Pt/(RuxSn1-x)O-2 were compared with those on commercial Pt/C and PtRu/C catalysts. Oxidation of COads on Pt/(RuxSn1-x)O-2 starts at lower positive potentials than on PtRu/C and Pt/C. Potentiodynamic polarization curves and chronoamperometric curves of methanol oxidation indicated higher initial activity of the Pt/(RuxSn1-x)O-2 catalyst compared to PtRu/C, but also a greater loss in current density over time. A potentiodynamic stability test of the catalysts revealed that deactivation of Pt/(RuxSn1-x)O-2 and Pt/C was primarily caused by poisoning of the Pt surface by residues of methanol oxidation, which mostly occurred during the first potential cycle. In the case of PtRu/C, the poisoning of the surface was minor and deactivation was caused by surface area loss of the PtRu.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "Electrochemical oxidation of methanol on Pt/(RuxSn1-x)O-2 nanocatalyst",
pages = "1716-1703",
number = "11",
volume = "78",
doi = "10.2298/JSC130718091K"
}
Krstajic, M. N., Obradović, M. D., Babić, B. M., Radmilović, V. R., Lačnjevac, U., Krstajić, N. V.,& Gojković, S. L.. (2013). Electrochemical oxidation of methanol on Pt/(RuxSn1-x)O-2 nanocatalyst. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 78(11), 1703-1716.
https://doi.org/10.2298/JSC130718091K
Krstajic MN, Obradović MD, Babić BM, Radmilović VR, Lačnjevac U, Krstajić NV, Gojković SL. Electrochemical oxidation of methanol on Pt/(RuxSn1-x)O-2 nanocatalyst. in Journal of the Serbian Chemical Society. 2013;78(11):1703-1716.
doi:10.2298/JSC130718091K .
Krstajic, Mila N, Obradović, Maja D, Babić, Biljana M., Radmilović, Velimir R, Lačnjevac, Uroš, Krstajić, Nedeljko V, Gojković, Snežana Lj, "Electrochemical oxidation of methanol on Pt/(RuxSn1-x)O-2 nanocatalyst" in Journal of the Serbian Chemical Society, 78, no. 11 (2013):1703-1716,
https://doi.org/10.2298/JSC130718091K . .
2
1
2

The kinetics of the hydrogen oxidation reaction on WC/Pt catalyst with low content of Pt nano-particles

Obradović, Maja D; Gojković, Snežana Lj; Elezović, Nevenka R.; Ercius, P; Radmilović, Velimir R; Vračar, Ljiljana M; Krstajić, Nedeljko V

(Elsevier Science Sa, Lausanne, 2012)

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 . .
16
12
15

Temperature dependence of the kinetics of oxygen reduction on carbon-supported Pt nanoparticles

Elezović, Nevenka R.; Babić, Biljana M.; Krstajić, Nedeljko V; Gojković, Snežana Lj; Vračar, Ljiljana M

(Srpsko hemijsko društvo, Beograd, 2008)

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 . .
10
9
10

Pt/C doped by MoOx as the electrocatalyst for oxygen reduction and methanol oxidation

Elezović, Nevenka R.; Babić, Biljana M.; Radmilović, Velimir R; Gojković, Snežana Lj; Krstajić, Nedeljko V; Vračar, Ljiljana M

(Elsevier Science Bv, Amsterdam, 2008)

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 . .
61
60
64

Magneli phase titanium oxides as catalyst support - Electrochemical behavior of Ebonex/Pt catalysts

Vračar, Ljiljana M; Gojković, Snežana Lj; Elezović, Nevenka R.; Radmilović, Velimir R; Jakšić, M.M.; Krstajić, Nedeljko V

(2006)

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 .
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21