电解液中添加KF对AB_5-型贮氢合金电化学性能的影响  

Electrochemical Performance Improvement of AB_5-type Metal Hydride Electrode by Adding KF in KOH Electrolyte

作　　者：陈艺文[1] 陈云贵[1] 朱丁[1] 吴朝玲[1] 晁栋梁[1] 

机构地区：[1]四川大学,四川成都610065

出　　处：《稀有金属材料与工程》2013年第5期905-908,共4页Rare Metal Materials and Engineering

基　　金：project supported by GD-MOE Coordination;project of Industry Academic and Research(2008B090500274);Chengdu Key Technologies R&Dprogram(10GGYB897GX-023)

摘　　要：研究了在6mol/LKOH电解液中添加不同浓度KF对商用AB5-型贮氢合金的电化学性能的影响,研究发现合金的循环性能和循环后期的高倍率性能提高,通过XRD,SEM,SEI等分析表明,在电解液中添加KF生成的LaF3能显著提高合金耐腐蚀的能力,同时阻止合金电极在循环过程中析氢过电位降低,提高合金的动力学性能。The influence of the added KF concentration in the 6 mol/L KOH electrolyte on the electrochemical performances of the commercial AB5-type hydrogen storage alloy was investigated. The cycle life and high-rate performance of the commercial AB5-type hydrogen storage alloy can be improved by adding KF to the electrolyte. The analyses of XRD, SEM and SEI show that the formation of LaF3 in KF-added electrode can obviously decrease the corrosion of the metal hydride electrode compared with that of the KF-free electrode which prevents the dropping of the hydrogen evolution reaction voltage of the electrode and results in the improvement of electrochemical dynamics of the electrode.

关 键 词：金属氢化物电极 LAF3 KF 循环性能 高倍率性能 

分 类 号：TG139.7[一般工业技术—材料科学与工程]