Acta Phys. -Chim. Sin. ›› 2001, Vol. 17 ›› Issue (12): 1086-1091.doi: 10.3866/PKU.WHXB20011206

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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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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)