Changes of crystal structure and hydrogen storage performances for multiphase La0.7Mg0.3Ni3 alloy upon gas–solid cycling

作     者：Yi-Ming Li Han-Wei Zhang Yang-Huan Zhang Zhuo-Cheng Liu Hui-Ping Ren 

作者机构：School of Materials Science and EngineeringShanghai UniversityShanghai 200072China Analytical and Testing CenterInner Mongolia University of Science and TechnologyBaotou 014010China Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal ResourcesInner Mongolia University of Science and TechnologyBaotou 014010China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2017年第36卷第2期

页      面：101-107页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51161015 and 51371094) the Application Technology Research and Development Foundation of Inner Mongolia(No.20111401) the Innovation Foundation of Inner Mongolia University of Science and Technology(No.2012NCL024) 

主　　题：RE-Mg-Ni hydrogen storage alloys Gas-solid cycling Partial amorphization Capacity degradation 

摘      要：In order to examine the effects of structure stability on the degradation behaviors of multiphase La0.7Mg0.3Ni3 alloy,changes of the crystal structure and hydrogen storage properties after gas-solid cycling were investigated in *** structural analysis identifies that（La,Mg）Ni3（PuNi3-type） phase transforms to amorphous,i.e.,hydrogen-induced amorphization（HIA） occurs whereas LaNi5（CaCu5-type）,（La,Mg）2Ni7（Ce2Ni7-type）,and（La,Mg）5Ni19（Pr5Co19-type） phases still keep crystalline upon hydriding/dehydriding *** amorphization remarkably affects both the gas-solid and electrochemical storage *** plateau of PCT curves becomes narrow and steep with ***,the maximum electrochemical capacity decreases notably after gas-solid hydrogenation *** electrochemical capacity reduction could be ascribed to both drop of the maximum storage capacity and the slope of plateau induced by partial *** direct electrochemical cycling,it is suggested that the capacity decay is mainly attributed to HIA in the initial stage.