PREPARATION AND HYDROGEN STORAGE KINETICS OF NANOCRYSTALLINE AND AMORPHOUS MG20NI8M2 (M=CO, NI) ALLOYS

摘要：

In order to obtain a nanocrystalline and amorphous structure in the Mg2Ni-type alloy, the melt spinning technology has been used to prepare the Mg20Ni8M2 (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. As the spinning rate is raised from 0 (As-cast was defined as the spinning rate of 0 m/s) to 30 m/s, the hydrogen absorption saturation ratio ( ), a ratio of the hydrogen absorption capacity in 5 min to the saturated hydrogen absorption capacity, are enhanced from 80.43％ to 94.38％ for the (M=Co) alloy and from 56.72％ to 92.74％ for the (M=Cu) alloy. The hydrogen desorption ratio ( ), a ratio of the hydrogen desorption capacity in 20 min to the saturated hydrogen absorption capacity of the alloy, are increased from 24.52％ to 51.67％ for the (M=Co) alloy and from14.89％ to 40.37％ for the (M=Cu) alloy. Furthermore, the high rate discharge ability (HRD), the limiting current density (IL) and the hydrogen diffusion coefficient (D) of the alloys notably mount up with the growing of the spinning rate.

关键词： Mg2Ni-type alloy Nanocrystalline and amorphous Preparation Hydrogen storage kinetics

作者: Yang-huan Zhang Zhong-hui Hou Guo-fang Zhang Xiao-gang Liu Le-le Chen Dong-liang Zhao

作者单位: Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 10008 ElectedState Key Laboratory, Inner Mongolia University of Science and Technology, Baotou 014010,Chin 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 7th International Green Energy Conference & The 1st DNL Conference on Clean Energy(第七届绿色能源国际会议暨第一届DNL洁净能源会议(IGEC)

会议地点: 大连

会议语种:英文

页码: 81

在线出版日期: 2012-05-28（万方平台首次上网日期，不代表论文的发表时间）