Electrochemical Impedance Spectra and Deterioration Mechanism of Metal Hydride Electrodes
Electrochemical Impedance Spectra and Deterioration Mechanism of Metal Hydride Electrodes
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DOI：
10.1149/1.2221180
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发表时间：
1992-07
影响因子：
3.9
通讯作者：
N. Kuriyama;T. Sakai;H. Miyamura;I. Uehara;H. Ishikawa;T. Iwasaki
中科院分区：
文献类型：
--
作者：
N. Kuriyama;T. Sakai;H. Miyamura;I. Uehara;H. Ishikawa;T. Iwasaki
金属氢化物电极的电化学阻抗谱由等效电路解释，该等效电路包括合金表面上的反应电阻、集流体与颗粒之间的接触电阻、与合金颗粒与颗粒接触相关的接触电阻以及瓦尔堡阻抗。根据解释，发现使用镀铜合金粉末的金属氢化物电极的劣化仅由合金表面的钝化引起。另一方面，使用未涂覆合金的电极的劣化主要是接触电阻的增加。
Electrochemical impedance spectrum of a metal hydride electrode was interpreted by an equivalent circuit including a reaction resistance on the alloy surface, a contact resistance between the current collector and the pellet, one related to alloy particle‐to‐particle contact, and a Warburg impedance. According to the interpretation, deterioration of a metal hydride electrode using copper‐coated alloy powder was found to be caused by passivation of the alloy surface only. On the other hand, deterioration of an electrode using uncoated alloy was dominated by increase of the contact resistances.