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Application of the site blocking method to the investigation of the kinetics of carbon monoxide electrooxidation on nanostructured Pt

Authors
  • Kuznetsov, Aleksey N.1, 2
  • Parmon, Valentin N.2
  • Savinova, Elena R.1, 3
  • 1 Université de Strasbourg, Ecole Européenne Chimie Polymères Matériaux, UMR 7515 du CNRS-UdS-ECPM, 25 rue Becquerel, Strasbourg, 67087, France , Strasbourg (France)
  • 2 Boreskov Institute of Catalysis, pr. Akademika Lavrentieva 5, Novosibirsk, 630090, Russian Federation , Novosibirsk (Russia)
  • 3 University of Strasbourg, International Center for Frontier Research in Chemistry, Strasbourg, France , Strasbourg (France)
Type
Published Article
Journal
Journal of Solid State Electrochemistry
Publisher
Springer Berlin Heidelberg
Publication Date
Oct 04, 2013
Volume
18
Issue
5
Pages
1195–1203
Identifiers
DOI: 10.1007/s10008-013-2251-8
Source
Springer Nature
Keywords
License
Yellow

Abstract

In this work, we apply a recently developed selective site blocking with gold adatoms (Kuznetsov et al. Electrocatal 3:211–220, 2012) for studying the electrooxidation of adsorbed carbon monoxide on electrodeposited Pt. The reaction is studied using chronoamperometry, and the obtained current transients are fitted with a nucleation-and-growth model in order to determine the characteristic kinetic parameters on defect and terrace (facet) sites. We conclude that Au selectively blocks defect sites up to very high coverages of 0.42 MLs, strongly slowing down the reaction kinetics. Blocking of defect sites with Au adatoms also results in an increase of the packing density of CO on terrace sites. The rate constant of CO oxidation on defects is higher than that on terraces and exhibits higher Tafel slope.

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