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Charge/Discharge Hysteresis Characteristics of an Amorphous Mg50Ni50 Hydride Electrode

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【作者】 刘卫红； 雷永泉； 孙大林； 王启东； 吴浩青；

【Author】 LIU Wei Hong 1,2,3 , LEI Yong Quan 2, SUN Da Lin 2, WANG Qi Dong 2, WU Hao Qing 3 1. Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200436, China 2. Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China 3. Department of Chemistry, Fudan University, Shanghai 200433, China

【机构】 Department of Chemistry,College of Sciences,Shanghai University,Department of Materials Science and Engineering Zhejiang University,Department of Materials Science and Engineering Zhejiang University,Department of Materials Science and Engineering Zhejiang University,Department of Chemistry,Fudan University Shanghai 200436, China； Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, ChinaDepartment of Chemistry, Fudan University, Shanghai 200433, China,Hangzhou 310027, China,Hangzhou 310027, China,Hangzhou 310027, China,Shanghai 200433, China；

【Abstract】 The hydrogenation/dehydrogenation thermodynamic properties of a Mg 50 Ni 50 alloy synthesized by mechanical alloying is measured by electrochemical method, and serious hydrogenation/dehydrogenation hysteresis characteristic was observed. The electrochemical impedance of the electrode discharge reaction of this electrode is mainly composed of charge transfer resistance R ct , hydrogen diffusion impedance Z w and surface H adsorption/desorption capacitance C ads . Electrochemical impedance analysis reveals that R ct is about one degree larger than the other impedance component. Thus it is reasonable to believe that discharge reaction is mainly dominated by the charge transfer reaction at the alloy surface, and the discharge hysteresis phenomenon is related to the factors that effect the charge transfer reaction. Hydroxides are present in the alloy surface before and after charging/discharging. These hydroxides would decrease the conductivity of the alloy surface and hinder the charge transfer process.

【关键词】 hysteresis characteristic； amorphous alloy； Mg based hydride electrode.；
【Key words】 hysteresis characteristic； amorphous alloy； Mg based hydride electrode.；
【基金】 theEducationalDevelopmentFoundationofShanghaiMunicipalCommissionofEducation (GrantNo.99SG3 9)
  • 【文献出处】 Journal of Shanghai University ,上海大学学报(英文版) , 编辑部邮箱 ,2003年01期
  • 【分类号】TG139.7
  • 【下载频次】19
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