Degradation of Bimetallic Model Electrocatalysts: An In Situ X-Ray Absorption Spectroscopy Study

被引：48

作者：

Friebel, Daniel ^{[1
]}

Miller, Daniel J. ^{[1
]}

Nordlund, Dennis ^{[1
]}

Ogasawara, Hirohito ^{[1
]}

Nilsson, Anders ^{[1
]}

机构：

[1] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2011年 / 50卷 / 43期

关键词：

ab initio calculations; electrochemistry; fuel cells; heterogeneous catalysis; X-ray spectroscopy; OXYGEN-REDUCTION; PLATINUM-MONOLAYER; SURFACE ALLOYS; OXIDATION; GROWTH; GOLD; REACTIVITY; ELECTRODES; DEPOSITION; CATALYSTS;

D O I：

10.1002/anie.201101620

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Gold support destabilizes platinum: Driven by the low surface energy of Au, a Pt fuel cell catalyst is removed from the surface of the Au support. Depending on the electrochemical potential, this removal can occur through Pt dissolution either into the Au substrate or into the electrolyte (see picture). In situ HERFD XAS measurements indicate formation of PtO2 by a dissolution-precipitation mechanism. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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收藏

页码：10190 / 10192

页数：3

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