Enhanced electrochemical hydrogen storage characteristics of the as-spun Mg2Ni-type alloys by substituting Ni with M (M=Cu, Co)

摘要：

Mg2Ni-type Mg20Ni10-xMx (M=Cu, Co; x=0, 1, 2, 3, 4) electrode alloys with nanocrystalline and amorphous structure were synthesized by melt-spinning technique. The microstructures of the as-spun alloys were characterized by XRD, SEM and HRTEM. The electrochemical hydrogen storage properties of the experimental alloys were measured. The obtained results show that the as-spun (M=Cu) alloys hold an entire nanocrystalline structure, whereas the as-spun (M=Co) alloys display a nanocrystalline and amorphous structure, confirming that the substitution of Co for Ni facilitates the glass formation in the Mg2Ni-type alloy. Furthermore, such substitution results in the formation of secondary phases Mg2Cu and MgCo2 instead of changing the major phase of Mg2Ni. The substitution of M (M=Cu, Co) for Ni markedly improves the electrochemical performances of the alloys, involving the discharge capacity and the cycle stability as well as the high rate discharge ability.

关键词： Mg2Ni-type electrode alloy Melt-spinning Element substitution Electrochemical characteristics

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, Baotou014010, Chi 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: 2011 International Conference on Advanced Materials and Engineering Materials(2011先进材料与工程材料国际会议 ICAMEM 2011)

会议地点: 沈阳

会议语种:英文

页码: 572-577

在线出版日期: 2011-11-22（万方平台首次上网日期，不代表论文的发表时间）