采用球磨方法制备LaMg11Ni+x%Ni(x=100,200)纳米晶?非晶合金,并利用自动恒电流系统测试合金的电化学储氢性能.使用附带测氢仪的差热分析(DSC)和Sievert's设备研究合金的气态储氢性能.实验结果表明,Ni含量的增加能显著改善球磨合金的气态及电化学储氢性能.球磨合金的气态吸氢量和吸氢速率随着球磨时间的增加出现最大值.但合金的放氢动力学性能随着球磨时间的增加一直增加.另外,球磨合金的放电容量和高倍率放电性能(DHR)都随球磨时间的增加先增加后减小.
Nanocrystalline and amorphous LaMg11Ni+x% Ni (x=100, 200, mass fraction) alloys were synthesized by mechanical milling. The electrochemical hydrogen storage properties of the as-milled alloys were tested by an automatic galvanostatic system. The gaseous hydrogen absorption and desorption properties were investigated by Sievert's apparatus and differential scanning calorimeter (DSC) connected with a H2 detector. The results indicated that increasing Ni content significantly improves the gaseous and electrochemical hydrogen storage performances of the as-milled alloys. The gaseous hydrogen absorption capacities and absorption rates of the as-milled alloys have the maximum values with the variation of the milling time. But the hydrogen desorption kinetics of the alloys always increases with the extending of milling time. In addition, the electrochemical discharge capacity and high rate discharge (HRD) ability of the as-milled alloys both increase first and then decrease with milling time prolonging.
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