氢化物对Mg_(2)Ni基合金储氢性能的影响  

Effect of hydride on the hydrogen storage performance of Mg_(2)Ni based alloys

作　　者：刘力[1] 杨天辉 周曦 孟冉浩 LIU Li;YANG Tianhui;ZHOU Xi;MENG Ranhao(Jiyuan Vocational and Technical College,Jiyuan 459000,Henan,China;Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]济源职业技术学院,河南济源459000 [2]郑州大学,郑州450001

出　　处：《有色金属科学与工程》2023年第6期825-832,共8页Nonferrous Metals Science and Engineering

基　　金：河南省科技攻关计划项目(2102210237)。

摘　　要：采用机械球磨法制备了纯Mg_(2)Ni合金和加入添加剂的Mg_(2)Ni+10%(质量比,下同)TiH_(2)、Mg_(2)Ni+10%NbH储氢合金,研究了添加剂TiH_(2)或NbH对Mg_(2)Ni储氢合金物相组成、显微形貌和储氢性能的影响。结果表明,相较于纯Mg_(2)Ni储氢合金,充分吸氢/放氢后,添加了10%TiH_(2)或10%NbH的储氢合金的Mg_(2)NiH_(4)/Mg_(2)Ni相晶胞体积均不同程度地减小;机械球磨后,TiH_(2)在储氢合金中均匀分布,NbH存在一定程度团聚。添加10%TiH_(2)或10%NbH的Mg_(2)Ni储氢合金的吸氢平台和放氢平台都高于纯Mg_(2)Ni合金,放氢反应过程中的焓变和熵变都小于纯Mg_(2)Ni合金。在相同时间内,储氢合金的放氢容量从大到小的顺序为:Mg_(2)Ni+10%TiH_(2)>Mg_(2)Ni+10%NbH>纯Mg_(2)Ni合金,并且温度为573 K时,储氢合金达到最大放氢容量所需时间从小到大的顺序为:Mg_(2)Ni+10%TiH_(2)<Mg_(2)Ni+10%NbH<纯Mg_(2)Ni合金。加入TiH_(2)或NbH会增加储氢合金的反应速率,并且TiH_(2)对氢扩散性能的改善效果优于NbH。Pure Mg_(2)Ni,Mg_(2)Ni with TiH_(2)of 10%and Mg_(2)Ni with NbH of 10%hydrogen storage alloys were prepared by mechanical ball milling,respectively.The effects of additives(TiH_(2),NbH)on the phase composition,microstructure and hydrogen storage properties of Mg_(2)Ni hydrogen storage alloys were studied.The results showed that the unit cell volume of the Mg_(2)NiH_(4)/Mg_(2)Ni phase of hydrogen storage alloys added with 10%TiH_(2)or NbH,decreased to varying degrees,after sufficient hydrogen absorption/desorption,compared with pure Mg_(2)Ni hydrogen storage alloy.TiH_(2)was uniformly distributed in the hydrogen storage alloys after mechanical ball milling,while NbH was agglomerated to a certain extent.The hydrogen absorption and desorption platforms of the hydrogen storage alloys with the addition of 10%TiH_(2)or NbH were higher,and the enthalpy change and entropy change in the process of hydrogen evolution reaction were smaller than that of pure Mg_(2)Ni alloy.In the same amount of time,hydrogen evolution capacity of hydrogen storage alloys was listed in order from the largest to the smallest:Mg_(2)Ni+10%TiH_(2)>Mg_(2)Ni+10%NbH>pure Mg_(2)Ni alloy.When the temperature was 573 K,the time required for the hydrogen storage alloy to reach the maximum hydrogen release capacity in order from least to most was Mg_(2)Ni+10%TiH_(2)<Mg_(2)Ni+10%NbH<pure Mg_(2)Ni alloy.Adding hydride TiH_(2)or NbH will increase the reaction rate constant of hydrogen storage alloys,and TiH_(2)improves hydrogen diffusion performance better than NbH.

关 键 词：氢化物 储氢合金 物相组成 显微形貌 储氢性能 

分 类 号：TM912[电气工程—电力电子与电力传动] U463[机械工程—车辆工程]