摘要
采用化学镀铜的方法,对A2B7型贮氢合金La0.75Mg0.25Ni3.2Co0.2Al0.1进行表面包覆处理,系统研究了不同温度下表面包覆铜对La0.75Mg0.25Ni3.2Co0.2Al0.1合金电极电化学性能的影响。结果表明:与未包覆相比,包覆后合金电极的高倍率放电性能、交换电流密度、氢的扩散速率和循环寿命均得到明显的提高,并且随着镀铜反应温度的升高而增大,但合金电极的最大放电容量有所降低。
A2 B2-type La0.75 Mg0.25 Ni3. 2 Co0. 2 Al0.1 hydrogen storage alloy was coated by means of chemi- cal plating. The effects of Cu coatings on the electrochemical properties of the hydrogen storage alloy were studied at different temperatures systematically. The results show that the cycling stability of the electrode is improved. The Cu coated powder electrode is better than bare electrode in exchange current density Ⅰ0, high rate discharge ability and hydrogen diffusion coefficient D with increasing re- action temperature. The maximum discharge capacity of alloy electrodes decreases.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2013年第5期44-47,52,共5页
Journal of Materials Engineering
基金
内蒙古科技大学科技创新基金资助项目(2009NC019)
关键词
A2B7型贮氢合金
化学镀铜
电化学性能
A2 B7 type hydrogen storage alloy
Cu coating
electrochemical property
