Investigations of bifunctional mechanism in methanol oxidation on carbon-supported Pt and Pt-Ru catalysts

被引：0
|
作者：
Guo, Yonglang [1 ]
Zheng, Dingqin
Liu, Huiyong
Friedrich, A.
Garche, J.
机构：
[1] Fuzhou Univ, Coll Chem & Chem Engn, Fuzhou 350002, Peoples R China
[2] Ctr Solar Energy & Hydrogen Res, D-89081 Ulm, Germany
来源：
JOURNAL OF NEW MATERIALS FOR ELECTROCHEMICAL SYSTEMS | 2006年 / 9卷 / 01期
关键词：
DMFC; electrocatalyst; mechanism; methanol oxidation;
D O I：
暂无
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The mechanism of the CH3OH oxidation on the Pt/C and Pt-Ru/C electrodes has been studied by the cyclic voltammetry and potential oscillation. It is found that the rate of the CH3OH oxidation depends on various adsorbates such as CHOHads, COads, OHads and O-ads on the electrode surface. When the coverage of both COads and OHads is relatively high, an auto-catalysis occurs by oxidizing the bridge-bonded adsorbates into linear-bonded COads, which produces more vacant sites. Both the formation of the OHads and desorption of the COads are a couple of competitive reactions. This can lead to the potential oscillation. And the diffusion of the CH3OH in the solution affects the rate of its oxidation as well.
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页码：33 / 39
页数：7
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