非晶态Mg-Ni-Pr储氢合金的差压铸造及电化学性能

Electrochemical Performance of Differential Pressure Casting Mg-Ni-Pr Based Amorphous Hydrogen Alloy

研究了非晶态Mg-Ni-Pr储氢合金的差压铸造和电化学性能。结果表明,差压铸造能显著提高合金的非晶形成能力,Mg65Ni21Pr14的非晶临界尺寸由普通铜模喷铸法的3mm提高到4mm。非晶态合金Mg65Ni21Pr14在573K时的吸放氢量(质量分数)分别为3.62%和3.48%;最大放电容量为342.6mA.h.g-1,20次循环后为302.2mA.h.g-1,是最大放电容量的88.2%,循环稳定性高于其他非晶态Mg-Ni系储氢合金。

Electrochemical performance of differential pressure casting Mg-Ni-Pr amorphous storage hydrogen alloy was investigated.The results indicate that differential pressure casting can significantly improve the glass formation ability,and critical size of amorphous Mg65Ni21Pr14 alloy is increased from 3 mm in conventional copper mold spraying to 4 mm in differential pressure casting.The maximum hydrogen absorption capacity and effective hydrogen absorption capacity of the amorphous alloy reach 3.62% and 3.48%(weight percentage),respectively,at 573K.The highest electrochemical capacity makes about 342.6 mA·h·g-1,and it is 302.2 mA·h·g-1 after 20 cycles,88.2% of the maximum electrochemical capacity,so the cycle stability is higher than other Mg-Ni-Pr based amorphous hydrogen storage alloys.