Issue 4, 2013
From the journal:

New Journal of Chemistry

Microstructure and electrochemical hydrogen storage properties of La–R–Mg–Ni-based alloy electrodes

Zhijie Gao,a   Long Kang*a  and  Yongchun Luoab  

* Corresponding authors

a Department of Materials Science and Engineer, Lanzhou University of Technology, Lanzhou, P R China
E-mail: kangl@lut.cn, gaozhijie1983@126.com
Fax: +86-931-280-6962
Tel: +86-931-275-6306

b State Key Laboratory of Advanced Non-Ferrous Materials, Lanzhou University of Technology, Lanzhou, P R China

Abstract

La0.63R0.2Mg0.17Ni3.1Co0.3Al0.1 (R = La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Y, Sc) alloys were prepared by induction melting followed by annealing treatment at 1173 K for 8 h. The alloys consisted mainly of a La2Ni7 phase and LaNi5 phases as explored by XRD and EPMA. Substitution of rare earth metals for La was favorable for the formation of a Ce2Ni7-type phase. Electrochemical experiments showed that all alloy electrodes exhibited good activation characteristics, that the discharge capacity improved with the substitution of Ce–Sc for La, and the La0.63Y0.2Mg0.17Ni3.1Co0.3Al0.1 alloy possessed the maximum discharge capacity (400.6 mA h g−1). At the same time, the cyclic stability of alloy electrodes was also improved by substitution of Ce–Sc at La sites, and the capacity retention rate at the 100th cycle was increased by 23.6% for the Gd-substituted alloy. The Yb-substituted alloy possessed excellent high rate dischargeability (HRD900 = 92.84%). All experiments implied that the alloy electrode with R = Gd possessed excellent overall electrochemical properties.

Graphical abstract: Microstructure and electrochemical hydrogen storage properties of La–R–Mg–Ni-based alloy electrodes

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Article information

DOI
https://doi.org/10.1039/C3NJ41044G
Article type
Paper
Submitted
18 Nov 2012
Accepted
22 Jan 2013
First published
23 Jan 2013

New J. Chem., 2013,37, 1105-1114

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Microstructure and electrochemical hydrogen storage properties of La–R–Mg–Ni-based alloy electrodes

Z. Gao, L. Kang and Y. Luo, New J. Chem., 2013, 37, 1105 DOI: 10.1039/C3NJ41044G

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