微包覆钴贮氢合金电极电化学性能的研究  

Study on Electrochemical Performance of Electroless Cobalt Coating for Microencapsution of Hydrogen Storage Alloys

作　　者：夏同驰[1] 张胜利[1] 王树新[1] 黄鲲[1] 田文增[1] 

机构地区：[1]郑州轻工业学院材料与化工学院,河南郑州450002

出　　处：《电化学》2004年第2期235-239,共5页Journal of Electrochemistry

基　　金：河南省科技攻关项目 (0 2 2 43 80 0 0 1 )资助

摘　　要：　以化学镀钴方法微包覆处理贮氢合金,用交流阻抗、循环伏安以及模拟电池充放电实验研究了该贮氢合金电极的电化学性能.结果表明,贮氢合金经包覆钴后,即可减小电极表面的电化学反应阻抗,提高其催化活性,并降低充放电过程的极化,从而增大了电极的放电容量和充电效率.相关的电极过程为扩散控制.The chemical cobalt plating method is used to treat on the hydrogen storage alloys.Effect of the surface treatment on the electrochemical performance of MH eletrodes was investigated by carrying out experimental methods of CV,AC and charge/discharge cycle tests. The results showed that after microencapsulation with cobalt, the impedance of electrochemical reaction on the surface and polarization during chare/discharge process was markedly decreased; and the electrocatalytic activity on the surface, discharge capacity,charge efficiency was improved. It was also indicated that the anode reaction of MH electrode treated was controlled by diffusion process.

关 键 词：微包覆处理 贮氢合金电极 电化学性能 化学镀钴 交流阻抗 循环伏安 金属/氢化物镍电池 

分 类 号：TM911[电气工程—电力电子与电力传动]