Abstract Mg3GeNi2 hydrogen storage electrode alloy was synthesized successfully via mechanical milling followed by sintering, and its electrochemical performance as the negative electrode material in a nickel-metal hydride (Ni-MH) battery was studied for the first time. Then, different amounts of nano-nickel were added to the selected alloy with the pre-milling duration of 60 h to further improve the electrochemical performance. XRD results indicate that partial substitution of Mg by Ge in Mg2Ni can form a stable new phase of Mg3GeNi2 with excellent cycle stability. Nano-Ni addition can increase dramatically the discharge capacity and electrochemical kinetics of the alloy, which is attributed to the good electrocatalytic capability of the nano-Ni. The Mg3GeNi2-5 wt.% nano-Ni sample shows the optimum overall properties with the best electrochemical kinetics and the highest discharge capacity.

中文翻译：

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Mg3GeNi2合金电化学储氢性能

摘要 通过机械研磨和烧结成功合成了Mg3GeNi2储氢电极合金，并首次研究了其作为镍氢电池负极材料的电化学性能。然后，将不同量的纳米镍添加到选定的合金中，预铣削时间为 60 小时，以进一步提高电化学性能。XRD结果表明，在Mg2Ni中用Ge部分取代Mg可以形成稳定的Mg3GeNi2新相，具有优异的循环稳定性。纳米镍的加入可以显着提高合金的放电容量和电化学动力学，这归因于纳米镍良好的电催化能力。Mg3GeNi2-5 重量。