Influences of the substitution of Fe for Ni on structures and electrochemical performances of the as-cast and quenched La0.7Mg0.3Co0.45Ni2.55-xFex (x = 0-0.4) electrode alloys

被引：0
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作者：
Zhang, Yang-Huan [1 ,2 ]
Li, Bao-Wei [1 ]
Ren, Hui-Ping [1 ]
Wu, Zhong-Wang [1 ]
Dong, Xiao-Ping [2 ,3 ]
Wang, Xin-Lin [2 ]
机构：
[1] School of Material, Inner Mongolia University of Science and Technology, Baotou, 014010, China
[2] Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing, 100081, China
[3] School of Material Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China
来源：
Journal of Alloys and Compounds | 2008年 / 460卷 / 1-2期
关键词：
In order to improve the cycle stability of the La-Mg-Ni system PuNi3-type hydrogen storage electrode alloys; Ni in the alloy was partially substituted by Fe. The La0.7Mg0.3Co0.45Ni2.55-xFex (x = 0; 0.1; 0.2; 0.3; 0.4) hydrogen storage alloys were prepared by casting and rapid quenching. The effects of the substitution of Fe for Ni on the structures and electrochemical performances of the as-cast and quenched alloys were investigated in detail. The results of the electrochemical measurement indicate that the substitution of Fe for Ni obviously decreases the discharge capacity; high rate discharge capability (HRD) and discharge potential of the as-cast and quenched alloys; but it significantly improves their cycle stabilities; and its positive impact on the cycle life of as-quenched alloy is much more significant than on that of the as-cast one. The microstructure of the alloys analyzed by XRD; SEM and TEM show that the as-cast and quenched alloys have a multiphase structure which is composed of two major phases (La; Mg)Ni3 and LaNi5 as well as a residual phase LaNi2. The substitution of Fe for Ni helps the formation of a like amorphous structure in the as-quenched alloy. With the increase of Fe content; the grain sizes of the as-quenched alloys significantly reduce; and the lattice constants and cell volumes of the alloys obviously increase. © 2007 Elsevier B.V. All rights reserved;
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页码：414 / 420
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