Catalysis of ethanol electro oxidation by PtRu: the influence of catalyst composition

被引:161
作者
Camara, GA [1 ]
de Lima, RB [1 ]
Iwasita, T [1 ]
机构
[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil
基金
巴西圣保罗研究基金会;
关键词
electrocatalysis; ethanol electrooxidation; FTIR; fuel cell; PtRu electrodeposits;
D O I
10.1016/j.elecom.2004.06.001
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
The catalytic activity for ethanol oxidation is studied as a function of the atomic composition of PtRu electrodeposits. Chronoamperometric curves taken at 0.5 V show that the current for ethanol oxidation at PtRu electrodeposits, measured 30 min after the application of a potential step from 0.05 V, increases in the presence of Ru up to a Ru content of about 40%. The highest value observed at 0.5 V vs. RHE was 30 muA/cm(2) at 25 degreesC. There is a relatively narrow range of PtRu compositions that present a high rate of ethanol oxidation. Pure Ru has no activity towards ethanol oxidation at room temperature. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:812 / 815
页数:4
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