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

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)