Effects of preparation conditions on performance of carbon-supported nanosize Pt-Co catalysts for methanol electro-oxidation under acidic conditions

被引:122
作者
Zeng, JH [1 ]
Lee, JY [1 ]
机构
[1] Natl Univ Singapore, Dept Chem & Biomol Engn, Singapore 119260, Singapore
关键词
Pt-Co; carbon monoxide resistance; methanol electro-oxidation; nanoparticles; fuel cell; catalyst;
D O I
10.1016/j.jpowsour.2004.08.022
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
Carbon-supported Pt-Co and Pt catalysts are prepared by NaBH4 reduction of metal precursors. The particles size of Pt-Co varies with the pH used in the preparation, it is largest (12 nm) in alkaline solution and smallest (3.7 nm) in un-buffered solution. For the latter, X-ray photoelectron spectroscopy shows that Pt exists principally in the metallic state, whereas cobalt is mostly oxidized. The performance of the catalysts for methanol electro-oxidation in acidic media at room temperature is evaluated and compared with that of a Pt/C catalyst. Electrochemical measurements by cyclic voltammetry and chronoamperometry demonstrate consistently high catalytic activities and improved resistance to carbon monoxide for the Pt-Co catalysts, particularly for that prepared in un-buffered solution. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:268 / 273
页数:6
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