Electrochemical Performance Improvement of AB₅-type Metal Hydride Electrode by Adding KF in KOH Electrolyte

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• 作者：Chen Yiwen ; Chen Yungui ; Zhu Ding ; Wu Chaoling ; Chao Dongliang
• 关键词：metal-hydride electrode ; LaF3 ; KF ; cycle life ; HRD
• 刊名：Rare Metal Materials and Engineering
• 出版年：2013
• 出版时间：May, 2013
• 年：2013
• 卷：42
• 期：5
• 页码：905-908
• 全文大小：584 K

文摘

The influence of the added KF concentration in the 6 mol/L KOH electrolyte on the electrochemical performances of the commercial AB₅-type hydrogen storage alloy was investigated. The cycle life and high-rate performance of the commercial AB₅-type hydrogen storage alloy can be improved by adding KF to the electrolyte. The analyses of XRD, SEM and SEI show that the formation of LaF₃ in KF-added electrode can obviously decrease the corrosion of the metal hydride electrode compared with that of the KF-free electrode which prevents the dropping of the hydrogen evolution reaction voltage of the electrode and results in the improvement of electrochemical dynamics of the electrode.