Improved physical and electrochemical hydrogen storage kinetics of the as-spun Mg2Ni-type alloys by substituting Ni with M (M=Co, Cu)

摘要：

　　In order to improve the physical and electrochemical hydrogen storage kinetics of the Mg2Ni-type alloys,Ni in the alloy was partially substituted by M (M=Co,Cu).Melt-spinning technology was used for the preparation of the Mg20Ni10-xMx (M=Co,Cu; x=0,1,2,3,4) hydrogen storage alloys.The structures of the as-cast and spun alloys are characterized by XRD,SEM and TEM.The physical and electrochemical hydrogen storage kinetics of the alloys is measured.The results show that the as-spun (M=Cu) alloys hold an entire nanocrystalline structure,whereas the as-spun (M=Co) alloys exhibit a nanocrystalline and amorphous structure,confirming that the substitution of Co for Ni facilitates the glass formation in the Mg2Ni-type alloy.The substitution of M (M=Co,Cu) for Ni engenders an insignificant effect on the hydrogen absorption kinetics of the alloys,but it markedly ameliorates the hydrogen desorption kinetics of the alloys and the high rate discharge ability.With an increase of the M (M=Co,Cu) content from 0 to 4,the hydrogen desorption ratio (R(2)(d)0) is enhanced form 20.0% to 65.43% for the as-spun (20 m/s) alloy (M=Co),and from 20.0% to 52.88% for the as-spun (20 m/s) alloy (M=Cu).

关键词： Mg2Ni-type alloy Melt spinning Element substitution Hydrogen storage kinetics

作者: Yang-huan Zhang Bao-wei Li Hui-ping Ren Zai-guang Pang Zhong-hui Hou Dong-liang Zhao

作者单位: Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 10008 Elected State Key Laboratory, Inner Mongolia University of Science and Technology, Baotou 014010, Ch Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 10008

会议类型: 国际会议

会议名称: the 2012 International Conference on Frontiers of Advanced Materials and Engineering Technology (2012年先进材料与工程技术国际会议(FAMET 2012))

会议地点: 厦门

会议语种:英文

页码: 423-428

在线出版日期: 2012-01-04（万方平台首次上网日期，不代表论文的发表时间）