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Hydrogen Electrooxidation on PdAu Supported Nanoparticles: An Experimental RDE and Kinetic Modeling Study Full article

Общее Language: Английский, Genre: Full article,
Status: Published, Source type: Original
Journal Catalysis Today
ISSN: 0920-5861 , E-ISSN: 1873-4308
Output data Year: 2013, Volume: 202, Pages: 70-78 Pages count : 9 DOI: 10.1016/j.cattod.2012.03.076
Tags Heyrovsky-Volmer and Tafel-Volmer mechanisms, Hydrogen oxidation reaction, Palladium-Gold electrodes
Authors Bonnefont A. 1 , Simonov A.N. 2 , Pronkin S.N. 3 , Gerasimov E.Yu. 2 , Pyrjaev P.A. 2 , Parmon V.N. 2 , Savinova E.R. 3
Affiliations
1 Institut de Chimie, UMR 7177, CNRS-Université de Strasbourg, 4 rue Blaise Pascal, 67000 Strasbourg, France
2 Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Prospekt Akademika Lavrentieva, 5, Novosibirsk 630090, Russia
3 Laboratoire des Matériaux, Surfaces et Procédés pour la Catalyse, ECPM, Université de Strasbourg, UMR 7515 CNRS-UdS, 25 rue Becquerel, 67087 Strasbourg Cedex 2, France

Funding (2)

1 Council for Grants of the President of the Russian Federation МК-380.2011.3
2 European Commission 32175 FP6-2004-NMP-TI-4 FCANODE

Abstract: The influence of the apparent Pd coverage on Au nanoparticles on the kinetics of the hydrogen oxidation (HOR) reaction has been explored by combined experimental rotating disc and microkinetic modeling study. PdAu bimetallic electrodes with variable Pd coverage in the interval from 0.07 to 2 MLs were obtained by electrodeposition of Pd on carbon supported Au nanoparticles. The experimental rotating disc electrode curves have been analyzed with the help of a kinetic model, in order to shed light on the predominant HOR mechanism (Heyrovsky–Volmer vs. Tafel–Volmer), the nature of the rate determining step, and their dependence on the Pd coverage, and get an insight into the type of HOR intermediate. The kinetic modeling suggests that the Heyrovsky–Volmer mechanism can reproduce the experimental curves for the whole range of Pd coverages explored. However, the Tafel step cannot be fully discarded around the equilibrium potential, its eventual contribution increasing as the coverage of Pd is reduced. The results of this work support a weakly adsorbed Had intermediate in the HOR on Pd, its Gibbs energy of adsorption decreasing from positive to near-zero values with the decrease of the apparent Pd coverage, underlying the enhancement of the hydrogen oxidation activity of PdAu compared to pure Pd.
Cite: Bonnefont A. , Simonov A.N. , Pronkin S.N. , Gerasimov E.Y. , Pyrjaev P.A. , Parmon V.N. , Savinova E.R.
Hydrogen Electrooxidation on PdAu Supported Nanoparticles: An Experimental RDE and Kinetic Modeling Study
Catalysis Today. 2013. V.202. P.70-78. DOI: 10.1016/j.cattod.2012.03.076 publication_identifier_short.wos_identifier_type publication_identifier_short.scopus_identifier_type publication_identifier_short.rinz_identifier_type
Dates:
Submitted: Jan 5, 2012
Accepted: Mar 22, 2012
Published online: May 4, 2012
Published print: Mar 15, 2013
Identifiers:
publication_identifier.wos_identifier_type WOS:000311939800010
publication_identifier.scopus_identifier_type 2-s2.0-84870554364
publication_identifier.rinz_identifier_type 24934047
publication_identifier.accession_number_identifier_type 2012:663532
publication_identifier.chemical_accession_number_identifier_type 158:117541
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