Effect of rare earth elements on electrochemical properties of La-Mg-Ni-based hydrogen storage alloys

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	Effect of rare earth elements on electrochemical properties of La-Mg-Ni-based hydrogen storage alloys
	Li, Yuan ; Han, Da ; Han, Shumin ; Zhu, Xilin ; Hu, Lin ; Zhang, Zhong ; Liu, Yuwen ; Han D(韩达)
刊名	http://dx.doi.org/10.1016/j.ijhydene.2008.11.049
	2009-02
关键词	ELECTRODE ALLOYS PHASE-STRUCTURE SUBSTITUTION MICROSTRUCTURE HYDRIDES PR
英文摘要	National Natural Science Foundation of China [20673093]; Natural Science Foundation of Hebei Province [B2007000303]; La(0.60)R(0.20)Mg(0.20)(NiCoMnAl)(3.5) (R = La, Ce, Pr, Nd) alloys were prepared by inductive melting. Variations in phase structure and electrochemical properties due to partial replacement of La by Ce, Pr and Nd, were investigated. The alloys consist mainly of LaNi(5) phase, La(2)Ni(7) phase and LaNi(3) phase as explored by XRD and SEM. The maximum discharge capacity decreases with Ce, Pr and Nd substitution for La. However, the cycling stability is improved by substituting Pr and Nd at La sites, capacity retention rate at the 100th cycle increases by 13.4% for the Nd-substituted alloy. The electrochemical kinetics measurements show that Ce and Pr substitution improves kinetics and thus ameliorates the high rate dischargeability (HRD) and low temperature dischargeability. The HRD at 1200 mA g(-1) increases from 22.1% to 61.3% and the capacity at 233 K mounts up from 90 mAh g-1 to 220 mAh g(-1) for the Ce-substituted alloy. (C) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
语种	英语
出版者	INT J HYDROGEN ENERG
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/88605]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Li, Yuan,Han, Da,Han, Shumin,et al. Effect of rare earth elements on electrochemical properties of La-Mg-Ni-based hydrogen storage alloys[J]. http://dx.doi.org/10.1016/j.ijhydene.2008.11.049,2009.
APA	Li, Yuan.,Han, Da.,Han, Shumin.,Zhu, Xilin.,Hu, Lin.,...&韩达.(2009).Effect of rare earth elements on electrochemical properties of La-Mg-Ni-based hydrogen storage alloys.http://dx.doi.org/10.1016/j.ijhydene.2008.11.049.
MLA	Li, Yuan,et al."Effect of rare earth elements on electrochemical properties of La-Mg-Ni-based hydrogen storage alloys".http://dx.doi.org/10.1016/j.ijhydene.2008.11.049 (2009).