Degradation of Carbon-Supported Pt Bimetallic Nanoparticles by Surface Segregation

被引：176

作者：

Mayrhofer, Karl J. J. ^{[1
]}

Hartl, Katrin ^{[1
]}

Juhart, Viktorija ^{[1
]}

Arenz, Matthias ^{[1
]}

机构：

[1] Tech Univ Munich, Lehrstuhl Phys Chem, D-85748 Garching, Germany

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2009年 / 131卷 / 45期

关键词：

OXYGEN REDUCTION; FUEL-CELLS; ALLOY; CO; ELECTROCATALYSIS; CATALYSTS; NANOSCALE; STABILITY; PLATINUM;

D O I：

10.1021/ja9074216

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Surface segregation of the non-noble component of a Pt bimetallic core-shell catalyst can occur even at room temperature under typical fuel cell cathode application conditions. While in an alkaline environment the nanoparticles remain stable, and the alteration in the surface composition can be tracked in situ; in an acidic electrolyte, any non-noble alloying material at the surface would immediately dissolve into the electrolyte. Therefore, such catalysts are expected to degrade steadily during operation in an acidic fuel cell until only Pt is left.

引用

页码：16348 / +

页数：4

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