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Electrochemical and kinetic study of as-cast and as-quench Mg2Ni-type hydrogen storage alloys

Published online by Cambridge University Press:  25 September 2013

Feng Hu ,
Yanghuan Zhang ,
Yin Zhang ,
Ying Cai ,
Jianyi Xu  and
Zhonghui Hou
Feng Hu*
Affiliation:
The School of Rare Earth, Inner Mongolia University of Science and Technology, Baotou 014010, China; and Elected State Key Laboratory, Inner Mongolia University of Science and Technology, Baotou 014010, China
Yanghuan Zhang
Affiliation:
Elected State Key Laboratory, Inner Mongolia University of Science and Technology, Baotou 014010, China
Yin Zhang
Affiliation:
The School of Rare Earth, Inner Mongolia University of Science and Technology, Baotou 014010, China
Ying Cai
Affiliation:
The School of Rare Earth, Inner Mongolia University of Science and Technology, Baotou 014010, China
Jianyi Xu
Affiliation:
The School of Rare Earth, Inner Mongolia University of Science and Technology, Baotou 014010, China
Zhonghui Hou
Affiliation:
The School of Rare Earth, Inner Mongolia University of Science and Technology, Baotou 014010, China
*
a)Address all correspondence to this author. e-mail: hufengnhm_001@163.com
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Abstract

To improve the electrochemical and kinetic performances of the Mg2Ni-type hydrogen storage alloys, Mg was partially substituted by La, and the rapid solidification technology was used for the preparation of Mg20−xLaxNi10 (x = 0, 2, 4, 6) alloys. The microstructures of the as-cast Mg20−xLaxNi10 (x = 0, 2, 4, 6) and as-spun Mg20−xLaxNi10 (x = 2) alloys were systematically studied through x-ray diffraction and high-resolution transmission electronic microscopy. Electrochemical hydrogen storage properties were measured by the automatic galvanostatic system. Electrochemical impedance spectrum, linear polarization, and step-potential discharge curves were plotted using electrochemical workstation. The results showed that substitution of La for Mg was helpful for forming multiphase structures, increasing the discharge capacity of the as-cast Mg20−xLaxNi10 (x = 0, 2, 4, 6) alloys. The increasing quenching rate facilitated the formation of amorphous and nanocrystalline structures of Mg18La2Ni10 (La2) alloy, effectively improving the electrochemical and kinetic properties of Mg18La2Ni10 (La2) alloys.

Keywords

nanostructureamorphoushydrogenation
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 19 , 14 October 2013 , pp. 2701 - 2708
Copyright
Copyright © Materials Research Society 2013 

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