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          Institute: Fritz-Haber-Institut     Collection: Physical Chemistry     Display Documents



ID: 232298.0, Fritz-Haber-Institut / Physical Chemistry
Electrocatalytic oxidation of CO on Pt-modified Ru(0001) electrodes
Authors:Lei, Ting; Zei, Mau-Scheng; Ertl, Gerhard
Language:English
Date of Publication (YYYY-MM-DD):2005-05-01
Title of Journal:Surface Science
Journal Abbrev.:Surf. Sci.
Volume:581
Issue / Number:2-3
Start Page:142
End Page:154
Copyright:© 2005 Elsevier B.V. All rights reserved.
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Various amounts of Pt were electrodeposited onto a Ru(0001) electrode, and the kinetics of electrooxidation of CO was studied by cyclic voltammetry. Ru(0001) covered with small amounts of Pt forming patches of 2D-monolayers exhibits only low activity if compared with the bare Ru(0001) or Pt(111) electrodes. However, with high Pt coverages associated with 3D cluster deposits the reactivity is markedly enhanced and reaches a maximum at about 50 % surface coverage and then decreases again. The results bear close resemblance to the properties of the reverse system, viz. Ru deposited onto Pt or even of Pt–Ru alloys and are rationalized in terms of a bifunctional mechanism: CO adsorbed at Pt sites react preferentially with OH–-species formed at adjacent Ru sites, while reaction on either Pt or Ru sites alone is less facile.
Free Keywords:Auger electron spectroscopy; Ruthenium; Platinum; Reflection high-energy electron diffraction (RHEED); Metal–electrolyte interfaces; Cyclic voltammetry; Single crystal epitaxy
External Publication Status:published
Document Type:Article
Communicated by:Gerhard Ertl
Affiliations:Fritz-Haber-Institut/Physical Chemistry
External Affiliations:Lei T, present address: University of Houston, Dept. of Chemistry, 136 Fleming Bldg., 4800 Calhoun, Houston, TX 77204, USA; Zei MS, present address: National Central University, Dept. of Physics, Jungda Rd. 300, Jungli 32054, Taiwan
Identifiers:URL:http://www.sciencedirect.com/science?_ob=ArticleUR...
DOI:10.1016/j.susc.2005.02.037
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