Ameliorated Hydrogen Storage Kinetics of Mg20NiTM3 (M=Co, Cu) Alloys by Melt Spinning
In order to obtain a nanocrystalline and amorphous structure in the Mg2Ni-type alloy,the melt spinning was applied to fabricate the Mg20NiTM3(M=Co,Cu) hydrogen storage alloys.The microstructures of the alloys were characterized by XRD,SEM and HRTEM.The effects of the melt spinning on the gaseous and electrochemical hydrogen storage kinetics of the alloys were investigated.The results indicate that the as-spun (M=Co) alloys display a nanocrystalline and amorphous structure as spinning rate grows to 20 m/s,while the as-spun (M=Cu) alloys hold an entire nanocrystalline structure even if a limited spinning rate is applied,suggesting that the substitution of Co for Ni facilitates the glass formation in the Mg2Ni-type alloy.The melt spinning remarkably ameliorates the gaseous hydriding and dehydriding kinetics of the alloys.The hydrogen absorption ratio (Ra5) and hydrogen desorption ratio (Rd20) are enhanced from 81.9% to 94.7% and from 34.9%to 57.3% for the (M=Co) alloy,and from 57.2% to 92.8% and from 21.6% to 49.6% for the (M=Cu)alloy by raising spinning rate from 0 (as-cast was defined as the spinning rate of 0 m/s) to 30 rr/s.Furthermore,the high rate discharge ability (HRD),the limiting current density (IL) and the hydrogen diffusion coefficient (D) of the alloys notably increase with the growing of the spinning rate.
Mg2Ni-type alloy Melt spinning Structure Hydrogen storage kinetics
Yang-huan Zhang Zhong-hui HOU Li-cui Chen TaiYang Hong-wei Shang 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, Baotou014010, Chi 1Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 1000 Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 10008
国际会议
香港
英文
880-885
2012-07-27（万方平台首次上网日期，不代表论文的发表时间）