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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 9    No. 3    September 1999

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Effects of Ca-substitution and surface treatment on electrochemical performances of Ml1.0-xCaxNi4.0Co0.6Al0.4 hydrogen storage alloy electrodes
Chen Weixiang(陈卫祥)1, Qi Jianqin(祁建琴)1, Chen Changpin(陈长聘)2

1. Department of Physics;
2. Department of Materials Science and Engineering,Zhejiang University, Hangzhou 310027, P. R. China

Abstract:The influences of Ca-substitution for Ml and surface treatment on electrochemical performances of Ml1.0-xCaxNi4.0Co0.6Al0.4 hydrogen storage alloy electrode were investigated. Ca-substitution withx<0.2 for Ml could improve its discharge capacity, but Ca-substitution withx>0.2 could decrease the capacity. It was also found that Ca-substitution deteriorates the electrocatalytic activity, high-rate dischargeability and cycling durability of the alloy electrode. In order to improve these properties of Ml1.0-xCaxNi4.0Co0.6Al0.4 alloy electrode, the alloy was treated in 6 mol/L KOH+0.02 mol/L KBH4 solution. The results showed that the surface treatment improves the electrochemical performances such as the electrocatalytic activity, high-rate dischargeability and cycling durability of the alloy electrode.

 

Key words: hydrogen storage alloy; electrode; Ca-substitution; surface modification

ISSN 1672-7029
CN 43-1423/U

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