Electrocatalytic oxidation of CO on Pt-modified Ru(0001) electrodes

被引：19
|
作者：
Lei, T [1 ]
Zei, MS [1 ]
Ertl, G [1 ]
机构：
[1] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany
来源：
SURFACE SCIENCE | 2005年 / 581卷 / 2-3期
关键词：
auger electron spectroscopy; ruthenium; platinum; reflection high-energy electron diffraction (RHEED); metal-electrolyte interfaces; cyclic voltammetry; single crystal epitaxy;
D O I：
10.1016/j.susc.2005.02.037
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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 213-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. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：142 / 154
页数：13
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