Abstract: A small amount of MgNi₂ was melted with AB₅ alloys which were analyzed by ICP, XRD and SEM. EIS, CV, cyclic anodic polarization curves and charge/discharge measurements were carried out to study the electrochemical properties of alloy B and mechanism of hydrogen storage. The experimental results show that the battery with alloy B as MH electrode shows higher and wider voltage platform, better high-rate charge/discharge capability and stability compared to alloy A as MH electrode. The electrochemical investigation strongly indicates that the improved characteristics are the result of the increased electrochemical catalytic activity due to the increment of the conductive surface area, the reduction of the contact resistance between alloy particles and the increased corrosion resistance of alloys.

Key words: MgNi2, Hydrogen alloy, Electrochemical performance