At room temperature, crystalline Mg-based alloys, including Mg₂Ni, MgNi, REMg₁₂ and La₂Mg₁₇, have been proved with weak electrochemical hydrogen storage performances. For improving their electrochemical property, the Mg is partially substituted by Ce in Mg–Ni-based alloys and the surface modification treatment is performed by mechanical coating Ni. Mechanical milling is utilized to synthesize the amorphous and nanocrystalline Mg_1−xCe_xNi_0.9Al_0.1 (x = 0, 0.02, 0.04, 0.06, 0.08) + 50 wt%Ni hydrogen storage alloys. The effects made by Ce substitution and mechanical milling on the electrochemical hydrogen storage property and structure have been analyzed. It shows that the as-milled alloys electrochemically absorb and desorb hydrogen well at room temperature. The as-milled alloys, without any activation, can reach their maximal discharge capacities during first cycling. The maximal value of the 30-h-milled alloy depending on Ce content is 578.4 mAh/g, while that of the x = 0.08 alloy always grows when prolonging milling duration. The maximal discharge capacity augments from 337.4 to 521.2 mAh/g when milling duration grows from 5 to 30 h. The cycle stability grows with increasing Ce content and milling duration. Concretely, the S₁₀₀ value augments from 55 to 82% for the alloy milled for 30 h with Ce content rising from 0 to 0.08 and from 66 to 82% when milling the x = 0.08 alloy mechanically from 5 to 30 h. The alloys’ electrochemical dynamics parameters were measured as well which have maximum values depending on Ce content and keep growing up with milling duration extending.

中文翻译：

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刚轧制的Mg-Ce-Ni-Al基合金的结构和电化学储氢性能

在室温下，已证明包括Mg ₂ Ni，MgNi，REMg ₁₂和La ₂ Mg ₁₇在内的结晶Mg基合金的电化学储氢性能较弱。为了改善其电化学性能，Mg-Ni基合金中的Mg部分被Ce取代，并且通过机械涂覆Ni进行表面改性处理。机械研磨用于合成非晶态和纳米晶态的Mg _{1- x} Ce _x Ni _0.9 Al _0.1（x ＝ 0、0.02、0.04、0.06、0.08）+ 50wt％的镍氢存储合金。分析了铈取代和机械研磨对电化学储氢性能和结构的影响。结果表明，铣削后的合金在室温下能很好地电化学吸收和解吸氢。研磨后的合金无需任何活化，就可以在第一次循环中达到其最大放电容量。30 h研磨合金的最大值取决于Ce含量为578.4 mAh / g，而x  = 0.08合金的最大值在延长研磨时间时始终会增长。当研磨时间从5小时增加到30小时时，最大放电容量从337.4 mAh / g增加到521.2 mAh / g。循环稳定性随Ce含量和研磨时间的增加而增加。具体来说，S ₁₀₀当将x  = 0.08的合金从5h研磨到30 h时，将Ce的含量从0升高到0.08，将Ce的含量从0升高到0.08，将其值从55％增加到82％。还测量了合金的电化学动力学参数，这些参数的最大值取决于Ce的含量，并且随着研磨时间的延长而不断增长。