This paper presents a new method of surface modification on LaNi5 hydrogen storage alloy. The hydrogen alloy was treated in the acid CuSO4 solution containing HF. The effect of HF on surface state of alloy was studied and the electrochemical properties of modified alloy were investigated. Electrochemical impedance spectra (EIS) was also applied to analyze the resistance property of alloy electrode after modification. SEM and XRD results showed that I-IF had corrosive effect on hydrogen alloy, which help copper grain to precipitate on alloy surface. EIS analysis showed that modified alloy had lower contact resistance and electrochemical polarization,which resulted in a higher conductivity and electrochemical activation. Electrochemical testing showed modified alloy had better activation behavior and excellent large current discharge ability. Thus it could well satisfy the requirement of the application as power sources on electric vehicles.
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