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采用不同球磨时间(10 h、20 h、30 h、40 h)制备了Mg22Y2Ni10Cu2+x wt.%Ni(x=0、50、100、150)复合材料,并对材料的结构、形貌、电化学及动力学储氢性能进行了系统的研究。分析了球磨时间和镍添加量对Mg22Y2Ni10Cu2合金储氢性能的影响。结果表明,球磨可以改善合金的显微结构,促进合金中非晶、纳米晶的形成,而镍的加入显著促进了该过程的进行,使复合材料中非晶、纳米晶的相含量大幅度升高;随球磨时间和镍复合量的增加,合金放电比容量显著增加,当复合镍为x=100、球磨时间为40 h时,其值已达到最大为669.7 m Ah·g-1。循环稳定性的改善也较为明显,复合镍x=150、球磨20 h试样的S20已经达到了80%。此外,球磨和镍的添加还可以明显优化合金的高倍率放电、交流阻抗和动电位极化等动力学性能。此外,包覆于合金表面的镍不但对合金性能起到催化作用,提高了合金的表面活性,还有效的提高了合金的综合储氢性能。
Mg22Y2Ni10Cu2 + x wt.% Ni (x = 0, 50, 100, 150) composites were prepared by different milling time (10 h, 20 h, 30 h, 40 h). The structure, morphology, Chemical and kinetic hydrogen storage performance of a systematic study. The effects of ball milling time and nickel addition on the hydrogen storage properties of Mg22Y2Ni10Cu2 alloy were analyzed. The results show that ball milling can improve the microstructure of the alloy and promote the formation of amorphous and nanocrystalline alloys. However, the addition of nickel significantly accelerates the growth of the alloy and greatly increases the phase content of amorphous and nanocrystalline composites High. The specific discharge capacity of the alloy increased with the ball milling time and nickel content increasing. When the composite nickel was x = 100 and the ball milling time was 40 h, the maximum value reached 669.7 m Ah · g-1. The improvement of the cycle stability was also obvious. The composite S20 with the nickel = 150 and the ball 20 h had reached 80% in 20 h. In addition, ball milling and nickel addition can significantly optimize the alloy’s high rate discharge, AC impedance and potentiodynamic polarization and other dynamic properties. In addition, the nickel coated on the alloy surface not only plays a catalytic role on the alloy performance, improves the surface activity of the alloy, but also effectively improves the alloy’s comprehensive hydrogen storage performance.