Effect of graphene addition on activation and kinetic properties of La-Mg-Ni-based hydrogen storage alloys  

作　　者：Dian-chen Feng Chun-ling Zheng Zhi-yuan Zhao Dong-sheng Zhou Hui-ping Ren Yang-huan Zhang 

机构地区：[1]School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou,014010,Inner Mongolia,China [2]Collaborative Innovation Center of Integrated Exploitation of Bayan Obo Multi-Metal Resources,Inner Mongolia University of Science and Technology,Baotou,014010,Inner Mongolia,China [3]Department of Functional Material Research,China Iron and Steel Research Institute Group,Beijing,100081,China

出　　处：《Journal of Iron and Steel Research International》2025年第1期227-238,共12页钢铁研究学报(英文版)

基　　金：supported by the Inner Mongolia Natural Science Foundation(2021MS05064);China Northern Rare Earth Group High-Tech Co.,Ltd.(Bayan Obo rare earth resources extraction and application research and key technology development,2022151).

摘　　要：The La_(1.7)Pr_(0.3)Mg_(16)Ni hydrogen storage alloy was prepared by medium-frequency induction melting,and then the composite hydrogen storage alloy powder of La_(1.7)Pr_(0.3)Mg_(16)Ni+x wt.%(x=0,2,4,and 6)graphene was prepared by ball milling for 10 h.The effect of the addition of graphene on the activation and hydrogen de/absorption properties of La_(1.7)Pr_(0.3)Mg_(16)Ni alloy was studied.The result demonstrated that these composite alloys were composed of La_(2)Mg_(17),La_(2)Ni_(3),and Mg_(2)Ni phases.After saturated hydrogen absorption,it was composed of LaH_(3),Mg_(2)NiH_(4),and MgH_(2)phases,while during the dehydrogenation process,it was composed of LaH_(3),Mg,and Mg_(2)Ni phases.The addition of graphene can help get a more homogeneous granule after ball milling and accelerate the first activation of dehydrogenation/hydrogen absorption.The hydrogen release activation energy of the alloys first decreases and then increases as the graphene content increases from x=0 wt.%to x=6 wt.%.The minimum activation energy of the composite hydrogen storage alloy is 51.22 kJ mol^(-1) when x=4 wt.%.

关 键 词：La-Mg-Ni alloy GRAPHENE Mechanical ball milling Activation property Dynamic performance 

分 类 号：TG1[金属学及工艺—金属学]