Electrochemical quartz crystal microbalance analysis of CO-tolerance at Pt-Fe alloy electrodes

被引:72
|
作者
Uchida, H
Ozuka, H
Watanabe, M
机构
[1] Yamanashi Univ, Clean Energy Res Ctr, Kofu, Yamanashi 4008511, Japan
[2] Yamanashi Univ, Fac Engn, Lab Electrochem, Kofu, Yamanashi 4008511, Japan
基金
日本科学技术振兴机构;
关键词
electrochemical quartz crystal microbalance; fuel cell; Pt alloy; anode catalyst; CO-tolerance;
D O I
10.1016/S0013-4686(02)00333-X
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
An electrochemical quartz crystal microbalance (EQCM) has been applied to investigate a CO-tolerance at Pt-Fe alloy electrodes, which exhibit excellent H-2 oxidation in the presence of 100 ppm CO. It was found that the Pt-Fe electrodes were electrochemically stabilized by a formation of a few monolayers of Pt-skin layer during several repetitive potential sweeps in 0.1 M HClO4 solution, i.e. a dissolution of alloy components followed by a rearrangement of thin Pt layer. In a positive-going potential scan at CO-adsorbed (theta(CO) = 1) electrodes of pure Pt and Pt-Fe alloy, a pre-oxidation peak was observed at 0.3-0.5 V versus RHE before a major CO oxidation peak at 0.7 V. Based on EQCM results, each pre-peak was assigned to an oxidation of weakly adsorbed CO at Pt-Fe alloy and adsorbed carboxylate at pure Pt, respectively. This is consistent with our previous results by in situ FTIR, and strongly supports a modified electronic structure of the Pt-skin from that of pure Pt, which has been proposed by us. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:3629 / 3636
页数:8
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