CO adsorption and oxidation on a Pt(111) electrode modified by ruthenium deposition: An IR spectroscopic study

被引：197
作者：
Friedrich, KA
Geyzers, KP
Linke, U
Stimming, U
Stumper, J
机构：
[1] FORSCHUNGSZENTRUM JULICH GMBH,INST ENERGITEKNIKK,D-52425 JULICH,GERMANY
[2] FORSCHUNGSZENTRUM JULICH GMBH,INST GRENZFLACHEN & VOKUUMPHYS,D-52425 JULICH,GERMANY
来源：
JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1996年 / 402卷 / 1-2期
关键词：
electroadsorption; electro-oxidation; electrode poisoning; IR spectroscopy;
D O I：
10.1016/0022-0728(95)04237-7
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
CO adsorption and electro-oxidation on a Pt(111) electrode modified by Ru deposition was studied by IR spectroscopy. The IR spectra in the region of the CO stretching vibration exhibit distinct bands which can be assigned to CO adsorbed on the Pt substrate (CO\Pt) and on Ru islands (CO\Ru). This is in contrast with IR studies of Pt - Ru alloy electrodes where only a single vibrational band of adsorbed CO is observed. The integrated band intensities of the CO\Ru and of CO\Pt bands on the Ru-modified Pt(111) electrode decrease simultaneously at the onset potential of CO oxidation. The results are interpreted within the framework of a bifunctional mechanism of CO electo-oxidation, postulating active Pt sites in close proximity to the Ru islands and a high mobility of the CO\Pt adsorbate layer. The differences in the IR spectra between the Ru\Pt(111) electrode and the Pt - Ru alloys are explained by disparate surface structures (Ru islands versus homogeneous distribution of Pt and Ru atoms).
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页码：123 / 128
页数：6
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