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

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2008
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Authors
Elezović, Nevenka R.
Babić, Biljana M.
Krstajić, Nedeljko V
Gojković, Snežana Lj
Vračar, Ljiljana M
Article (Published version)
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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.

Keywords:
temperature dependence / platinum catalyst / oxygen reduction reaction / enthalpy of activation / carbon support
Source:
Journal of the Serbian Chemical Society, 2008, 73, 6, 641-654
Publisher:
  • Srpsko hemijsko društvo, Beograd
Funding / projects:
  • Sinteza, karakterizacija i primena nanostruktuiranih katalizatora na različitim nosačima u gorivnim spregovima, elektrolizi vode i elektroorganskoj sintezi (RS-142038)

DOI: 10.2298/JSC0806641E

ISSN: 0352-5139

WoS: 000258789700005

Scopus: 2-s2.0-47049105414
[ Google Scholar ]
9
9
URI
http://rimsi.imsi.bg.ac.rs/handle/123456789/290
Collections
  • Radovi istraživača / Researchers’ publications
Institution/Community
Institut za multidisciplinarna istraživanja
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 . .

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