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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Influence of addition of Cu(OH)2 to
KOH alkaline electrolyte on electrochemical properties of
La2Mg0.9Al0.1Ni7.5Co1.5 h
WANG Da-hui(王大辉)1, LUO Yong-chun(罗永春)2, YAN Ru-xu(阎汝煦)1,
KANG Long(康 龙)2, HOU Xin-gang(侯新刚)1

1. State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials,
Lanzhou University of Science and Technology, Lanzhou 730050, China;
2. Key Laboratory of Non-ferrous Metal Alloys, Ministry of Education,
Lanzhou University of Science and Technology, Lanzhou 730050, China

Abstract: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.

 

Key words: hydrogen storage alloy; electrodeposition; La-Mg-Ni alloy; electrochemical properties

ISSN 1672-7029
CN 43-1423/U

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