Influence of addition of Cu(OH)2 to KOH alkaline electrolyte on electrochemical properties of La2Mg0.9Al0.1Ni7.5Co1.5 hydrogen storage alloy electrode

摘要：

The influence of the addition of Cu(OH)2 to 6 mol/L KOH alkaline electrolyte on the electrochemical properties of La2Mg0.9Al0.1Ni7.5Co1.5 hydrogen storage alloy electrode was investigated by electron probe X-ray microanalysis(EPMA),X-ray diffraction(XRD) and electrochemical measurements.EPMA micrographs and XRD patterns show that the surface of the hydride electrode is plated by metal copper film.The thickness and compactness of Cu film increase with the increment of charge-discharge cycle number.The copper film of the hydride electrode surface can keep the hydrogen storage alloy particle in the electrode interior from oxidizing availably.The addition of Cu(OH)2 to alkaline electrolyte lowers the activation property and the high rate dischargeability of the La2Mg0.9Al0.1Ni7.5Co1.5 hydride electrode,but has no negative effect on the maximum discharge capacity of the hydride electrode.Moreover,it is effective to improve the cyclic stability of the hydride electrode utilizing electrodeposit Cu film on the La2Mg0.9Al0.1Ni7.5Co1.5 hydride electrodes surface.

关键词： hydrogen storage alloy electrodeposition La-Mg-Ni alloy electrochemical properties

作者: WANG Da-hui LUO Yong-chun YAN Ru-xu KANG Long HOU Xin-gang

作者单位: State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials,Lanzhou University of Science and Key Laboratory of Non-ferrous Metal Alloys,Ministry of Education,Lanzhou University of Science and T

会议类型: 国际会议

会议名称: 2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)

会议地点: 长沙

会议语种:英文

在线出版日期: 2007-11-28（万方平台首次上网日期，不代表论文的发表时间）