Surface analysis, hydrogen adsorption and electrochemical performance of alkali-reduce treated hydrogen storage alloy

来源期刊：中国有色金属学报(英文版)2002年第1期

论文作者：陈卫祥 徐铸德 涂江平 李海洋 陈石 袁俊 鲍世宁

文章页码：147 - 151

Key words：hydrogen storage alloy;surface treatment;thermal desorption spectroscopy (TDS);eletrocatalytic activity;apparent activati on energy

Abstract: The hydrogen storage alloy powders (MlNi_4.0Co_0.6Al_0.4,Ml=rich-La mischmetal) were treated in a hot 6mol/L KOH+0.02mol/L KBH₄ solution,the surface compositions and chemical states of the treated and untreated alloys were analyzed by XPS and EDX, the hydrogen adsorption on the surface of these alloys was evaluated by thermal desorption spectroscopy (TDS),the effects of the surface treatment on the electrochemical performances of the alloy electrodes were investigated. The results show that the hydrogen adsorption is greatly strengthened by the surface modification, and hence leads to marked improvement in the electrocatalytic activity, the treated alloy exhibits higher exchange current density and lower apparent activation energy for the hydrogen electrode reaction than the untreated alloy.