Electrocatalysis by nanocrystalline tungsten carbides and the effects of codeposited silver

被引：45

作者：

Brady, C. D. A. ^{[1
]}

Rees, E. J. ^{[1
]}

Burstein, G. T. ^{[1
]}

机构：

[1] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB2 3QZ, England

来源：

JOURNAL OF POWER SOURCES | 2008年 / 179卷 / 01期

关键词：

tungsten carbide; electrocatalysis; passivity; hydrogen oxidation; base electrocatalyst;

D O I：

10.1016/j.jpowsour.2008.01.002

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：

The electrocatalytic activity of two nanocrystalline tungsten carbides, WC and W2C, towards the anodic oxidation of hydrogen in 1.5 M H2SO4 at 65 degrees C is presented. The carbides, which were synthesised by solid-state reduction of W(VI) using carbon, are both electrocatalytic. The WC phase shows greater electrocatalysis than the W2C phase, and also shows a greater degree of passivity against corrosion in the hot sulphuric acid electrolytes. The effect of codeposited silver is to enhance the electrocatalytic activity of the WC phase, whilst not in itself showing any clectrocatalysis. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：17 / 26

页数：10

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