Activity of ordered and disordered Pt-Co alloy phases for the electroreduction of oxygen in catalysts with multiple coexisting phases

被引：91

作者：

Koh, Shirlaine ^{[1
]}

Yu, Chengfel ^{[1
]}

Mani, Prasanna ^{[1
]}

Srivastava, Ratndeep ^{[1
]}

Strasser, Peter ^{[1
]}

机构：

[1] Univ Houston, Dept Chem & Biomol Engn, Houston, TX 77204 USA

来源：

JOURNAL OF POWER SOURCES | 2007年 / 172卷 / 01期

关键词：

metal alloys; fuel cell catalysis; oxygen reduction reaction; synthesis-property relationship; kinetic measurements;

D O I：

10.1016/j.jpowsour.2007.01.002

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：

This study investigates the relative electrochemical activity of ordered and disordered Pt-Co alloy phases coexisting in multi-phase catalyst materials. Of particular interest is the effect of the relative distribution between ordered and disordered Pt-Co alloy phases on the observed electrocatalytic activity for the oxygen reduction reaction (ORR). Three Pt-Co catalysts with identical overall composition, Pt50Co50, but with distinct distributions between two disordered face centered cubic (fcc) Pt-Co alloy phases and one ordered face centered tetragonal (fct) alloy phase are considered. Comparing the structure of the catalysts with their electrocatalytic activity for ORR suggests that the Co-rich (60-80 at% Co) disordered phase is linked to the observed 3 x activity enhancement compared to a pure Pt catalyst. If the ordered fct phase outweighs the Co-rich disordered phase the activity drops drastically. It is concluded that Co-rich disordered phases are the preferred Pt-Co alloy phases with respect to catalyst activity. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：50 / 56

页数：7

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