高等学校化学学报

高等学校化学学报

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LaNi4.7Al0.3单颗粒微电极电化学行为的研究

刘军, 杨毅夫, 邵惠霞, 高峰, 熊跃, 陈卫华   

  1. 武汉大学化学与分子科学学院, 武汉 430072
  • 收稿日期:2005-12-29 修回日期:1900-01-01 出版日期:2006-10-10 发布日期:2006-10-10
  • 通讯作者: 杨毅夫

Studies on Electrochemical Behavior of LaNi4.7Al0.3 Single Micro-particle Electrode

LIU Jun, YANG Yi-Fu, SHAO Hui-Xia, GAO Feng, XIONG Yue, CHEN Wei-Hua   

  1. College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, China
  • Received:2005-12-29 Revised:1900-01-01 Online:2006-10-10 Published:2006-10-10
  • Contact: YANG Yi-Fu

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摘要： 报道了一种单颗粒微电极制备新方法, 并研究了LaNi4.7Al0.3球形单颗粒微电极的电化学行为.

关键词: 储氢合金, LaNi4.7Al0.3, 单颗粒微电极, 循环伏安曲线, 扩散系数

Abstract:

A new single micro-particle electrode(SMPE) fabrication technique——the inlaid SMPE technique was introduced in this paper. The preparation procedure of an alloy SMPE was described in detail. Based on the SMPE technique, the electrochemical behavior of LaNi4.7Al0.3 spherical particles with two different radii was investigated. The results of CV study showed that more detailed electrochemical information of the alloy can be provided on the alloy SMPE as compared with that on the composite alloy electrode. The results of potential step study depict that H diffusion coefficient in LaNi4.7Al0.3 keeps almost constant when the size of the alloy particle changes, and the diffusion coefficient measured on the alloy SMPE[(2.5—2.6)×10-9 cm2/s] is about one order larger than that detected on the composite alloy electrode.

Key words: Hydrogen storage alloy, LaNi4.7Al0.3, Single micro\|particle electrode(SMPE), Cyclic voltammogram, Diffusion coefficient

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