Abstract
The YMg2Ni9 hydrogen storage alloy in-situ coated with Ni3S2 was successfully prepared by hydrothermal sulfurization treatment and investigated as the anode material in nickel-metal hydride (Ni-MH) batteries for the first time. Owing to the high electronic conductivity and electrocatalytic activity of Ni3S2 nanoflake coating, the electrochemical performance of the YMg2Ni9 alloy electrode is significantly enhanced. The alloy electrode treated in 0.3 M Na2S solution exhibits the highest discharge capacity of 230.8 mAh/g and superior cycling stability, maintaining a capacity retention rate of 85.1 % after 100 cycles. The increase in the discharge capacity of the electrode is credited to the Ni3S2 coating on the surface of the alloy, which possesses a nanoflake structure, facilitating the surface electrochemical reaction and providing more channels for hydrogen diffusion. In addition, Ni3S2 nanoflakes wrapped around the surface of the alloy can stabilize the reaction interface between the alloy and the electrolyte and slow down the alkali erosion, thus improving the cycle life of the electrode. The present study offers beneficial information for investigating a potential anode material for Ni-MH batteries.
Published Version
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