物理化学学报 >> 2001, Vol. 17 >> Issue (12): 1086-1091.doi: 10.3866/PKU.WHXB20011206

研究论文 上一篇    下一篇

RE(NiCoMnTi)5合金不同放电深度下的交流阻抗谱

朱光明;雷永泉;成少安;杨晓光;王启东   

  1. 厦门大学化学系固体表面物理化学国家重点实验室,厦门　361005; 浙江大学材料科学与工程系新材料与材料物理研究所,杭州　310027;浙江大学化学系,杭州　310027
  • 收稿日期:2001-05-21 修回日期:2001-08-21 发布日期:2001-12-15
  • 通讯作者: 朱光明 E-mail:gzhu@jingxian.xmu.edu.cn

AC Impedance of RE(NiCoMnTi)5 Alloy under Different Depth of Discharge

Zhu Guang-Ming;Lei Yong-Quan;Cheng Shao-An;Yang Xiao-Guang;Wang Qi-Dong   

  1. State Key Laboratory for Physical Chemistry of the Solid Surface,Department of Chemistry,Xiamen University,Xiamen　361005;Department of Materials Science and Engineering,Zhejiang University,Hangzhou,310027; Department of Chemistry,Zhejiang University,Hangzhou ,310027
  • Received:2001-05-21 Revised:2001-08-21 Published:2001-12-15
  • Contact: Zhu Guang-Ming E-mail:gzhu@jingxian.xmu.edu.cn

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摘要： 研究了La(NiCoMnTi)5、Ce(NiCoMnTi)5、Pr(NiCoMnTi)5和Nd(NiCoMnTi)5四种贮氢合金电极在不同放电深度(DOD, depth of discharge)下的交流阻抗谱.结果表明,在金属相α、氧化物相β和α＋β相区,合金有明显不同的放电动力学特征.在50％DOD时,四种合金表面吸附电阻Rsf和法拉第阻抗RF分别与它们的最大放电容量C50,max和高倍率放电率κ呈近似的线性关系,即Rsf和RF越小,C50,max和κ分别越大.

关键词: 贮氢电极合金, 交流阻抗, 稀土, 放电深度（DOD）

Abstract: Electrochemical impedance spectra (EIS) of RE(NiCoMnTi)5 alloys (RE=La,Ce,Pr,Nd) were measured and analyzed under different depths of discharge (DOD).The results reveal that at different phase areas,such as β,α＋β and α,the alloy shows quite different characteristics in their discharge kinetics. At the same DOD of 50％,the surface hydrogen adsorbing resistance Rsf and Faraday resistance RF of the four alloys represent an approximate linear relationship to their the maximum discharge capacity C50,max and the high-rate-dischargeabi-lity κ respectively,indicating the alloy with a higher Rsf and RF will have a larger capacity and better dischargeability.

Key words: Hydrogen storage electrode alloy;Electrochemical impedance;Rare earth, depth of discharge (DOD)