Studies of Surface Treatment Methods and Their Operating Mechanisms for Activation of Hydrogen Storage Electrode
- 1996年第2卷 
比较研究了采用电化学方法、ＫＢＨ４还原，ＫＯＨ刻蚀及ＫＯＨ＋ＫＢＨ４联合作用对Ｍｍ（ＮｉＣｏＭｎＡｌ）５型贮氢电极的活化作用，发现采用浓热ＫＯＨ处理的电极可以实现快速充分的活化，且具有放电电压低、稳定容量高及操作简便的特点．对活化过程的作用机理研究表明，ＫＯＨ活化主要是通过溶解反应使稀土和镍元素富集生成有利于吸氢反应的表面组成．ＫＢＨ４及电化学活化方法则是利用反应产生的活性氢裂解合金颗粒，生成高活性的新鲜表面和晶体缺陷Surface treatment methods by use of charge discharge cycling, KBH 4 reduction and KOH etching were parallely investigated for the rapid activation of Mn(NiCoMnAl) 5 electrode. It is found that the MH electrode treated with hot and concentrated KOH solution exhibits rapid and full activation, and also gives lower discharge overvoltage, higher stable capacity and improved cycleability. It is also revealed from SEM, EDAX and ICP analysis that the KOH activation of the electrode proceeds mainly through the enrichment of mischmetal and nickel in surface to form electrocatalytically active surface for hydrogen absorption reaction, but the surface modification with KBH 4 or electrochemical treatment takes place by the pulverization of the MH alloy particles by the hydrogenation reaction to create large amount highly reactive new surface and crystal defects.