微电极定量方法评价贮氢合金的电化学性质

Quantitative Evaluation of Electrochemical Properties of MH alloy by powder microelectrode

本文介绍了评价贮氢合金电化学性能的粉末微电极定量方法．贮氢合金粉末微电极的电极厚度和半径仅几十微米，材料用量约几微克，从而降低了欧姆极化和液相浓度极化，排除了粘结剂等电极工艺对性能的影响．通过吸收光谱测定微电极中贮氢合金载量，结合循环伏安和恒电流阶跃法可以简便地测量贮氢合金负极的电化学性能．

In this paper, a quantitative method by use of powder microelectrode combined with cyclic voltammetry and galvanostatic step is described for studying the electrochemical performance characteristic of hydrogen storage alloy(MH). Since the powder microelectrode uses only MH powder and has its depth and diameter of several tens of micrometer, the ohmic and concentration ploarization are greatly reduced and the influences of the technical factors in electrode preparation on the material performance are simply eliminated. Thus, with accurate determination of the load quantity of MH alloy in power microelectrode by absorption spectrometric technique, it is feasible to evaluate quickly and quantitatively the electrochemical properties of MH alloy as negative electrode material.