Electrochemical hydrogen storage of ball-milled Mg-rich Mg-Nd alloy with Ni powders

被引：0
|
作者：
Lu, Z.W. [1 ]
Sun, S. [1 ]
Li, G.R. [1 ]
Yan, T.Y. [1 ]
Qu, J.Q. [1 ]
Gao, X.P. [1 ]
机构：
[1] Institute of New Energy Material Chemistry, Department of Materials Chemistry, Nankai University, Tianjin, 300071, China
来源：
Journal of Alloys and Compounds | 2007年 / 433卷 / 1-2期
关键词：
The Mg-rich Mg-Nd alloy was synthesized by salt-cover-melting. It is found that the Nd5Mg41 phase with tetragonal structure exists as the main phase in the as-cast Mg-rich Mg-Nd alloy. The microstructure and electrochemical hydrogen storage of the composites prepared by ball-milling the Mg-rich Mg-Nd alloy with Ni powders are investigated. The result reveals that the addition of a larger amount of metallic Ni during the ball-milling process is beneficial to the formation of highly dispersed Ni nanocrystalline on the amorphous Mg-rich Mg-Nd alloy matrix of the composites. The composite; prepared by ball-milling the Mg-rich Mg-Nd alloy with 200 wt.% Ni; is demonstrated to have the discharge capacity of about 953 mAh/g in the first cycle. The appearance of stronger hydrogen adsorption peaks in cyclic voltammograms is very sensitive to the surface Ni-rich dispersion of the composites. The rate-determining step for the electrochemical reaction is transformed from a mixed process of the hydrogen diffusion and surface charge-transfer to a single process of the surface charge-transfer as the Ni amount in the Mg-rich Mg-Nd alloy-Ni composites is increased. © 2006 Elsevier B.V. All rights reserved;
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页码：269 / 273
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