1.Weishan Cisri-Eare Earth Materials Co., Ltd.,Jining 277600, Shandong, China 2.Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081, China 3.School of Material and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010,Nei Mongol, China
Abstract：In order to enhance the La-Mg-Ni-based A2B7-type electrode hydrogen storage alloy’s dynamic performance, the element La in A side has been partically substitued by M (M=Zr, Pr). In this paper, La0.55M0.2Mg0.25Ni3.2Co0.2Al0.1 (M=Zr, Pr) electrode alloy has been prepared by melt spinning in vacuum. At the same time, the structures of the as-cast and spun alloys are characterized by XRD、SEM and TEM, which reveal that the as-cast and spun alloys are of multiphase structures, including (La, Mg)2Ni7 and LaNi5 major phases and LaNi2 residual phase. Except for this, the as-spun Pr substituted alloy hold a mixed structure of nanocrystalline and amorphous structure, but for the as-spun Zr substituted alloy, displaying amorphous structure obviously. With the increasing of spinning rate, the high rate discharge capacity of the alloys first mount up and then decline. The tests of EIS, Tafel and Potentiostatic discharge imply that the kinetics of electrochemical hydrogen storage first mount up and then decline.
2014, Vol. 21 
