Improved Physical and Electrochemical Hydrogen Storage Kinetics of the Mg20Ni10-xMx (M=Cu, Co; x=0, 4) Alloys by Melt Spinning
It has come to light that the Mg2Ni-type alloy with a nanocrystalline/amorphous structure possesses superior hydrogen storage kinetics.The Mg2Ni-type Mg20Ni10-xMx (M=Cu,Co; x=0,4) hydrogen storage alloys were synthesized by a melt-spinning technique.The microstructures of the as-cast and spun alloys were characterized by XRD,SEM and HRTEM.The gaseous and electrochemical hydrogen storage kinetics of the alloys was measured.The results show that whatever spinning rate the as-spun (M=Cu) alloys hold an entire nanocrystalline structure.As spinning rate approaches to 20 m/s,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 melt spinning markedly improves the gaseous and electrochemical hydrogen storage kinetics of the alloys.The hydrogen absorption ratio (Rd5),hydrogen desorption ratio (Rd20) and the high rate discharge ability (HRD)notably mount up with the growing of the spinning rate.
Mg2Ni-type alloy Melt spinning Structure Hydrogen storage kinetics
Yang-huan Zhang Li-zhao Guo Hong-wei Shang Zhong-hui Hou Ying Cai Dong-liang Zhao
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
国际会议
杭州
英文
25-30
2012-03-23（万方平台首次上网日期，不代表论文的发表时间）