FORMIC-ACID OXIDATION ON PD-AD PLUS PT(100) AND PD-AD PLUS PT(111) ELECTRODES

被引：111

作者：

LLORCA, MJ ^{[1
]}

FELIU, JM ^{[1
]}

ALDAZ, A ^{[1
]}

CLAVILIER, J ^{[1
]}

机构：

[1] CNRS,LEI,F-92195 MEUDON,FRANCE

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1994年 / 376卷 / 1-2期

关键词：

D O I：

10.1016/0022-0728(94)03506-7

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Irreversible adsorption of palladium on Pt(100) and Pt(111) is used to form electrocatalysts combining two catalytic elements. Their electrocatalytic activity towards formic acid oxidation is examined. A dramatic effect of the presence of adsorbed palladium on Pt(100) on this reaction is observed with a considerable lowering of the oxidation potential and the absence of self-poisoning on open circuit. In contrast, the activity of the Pt(111) substrate is not greatly changed by adsorbed Pd. A deactivation of the Pd-ad + Pt(100) electrocatalyst is observed when the oxidation of formic acid takes place, suggesting a slow step in the formation of an adsorbed species which blocks the adsorption of formic acid as a first step of the overall reaction. At all palladium coverages of Pt(100), even with a multilayer of palladium, the activity of the modified electrode towards the electro-oxidation of formic acid was found to be higher than that of bulk palladium.

引用

页码：151 / 160

页数：10

共 14 条

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