Chin J Mater Res  2011, Vol. 25 Issue (4): 373-380    DOI:

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Gaseous and Electrochemical Hydrogen Storage Kinetics of As–Spun Nanocrystalline Mg2Ni1−xCux(x=0–0.4) Alloys

ZHANG Yanghuan1,2,   REN Huiping2,   MA Zhihong1,3,   LI Xia ZHANG1,2,  Guofang1,2,  ZHAO Dongliang1

1.Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081 2.Elected State Key Laboratory, Inner Mongolia University of Science and Technology, Baotou 014010 3.Baotou Research Institute of Rare Earths, Baotou 014010

ZHANG Yanghuan REN Huiping MA Zhihong LI Xia ZHANG Guofang ZHAO Dongliang. Gaseous and Electrochemical Hydrogen Storage Kinetics of As–Spun Nanocrystalline Mg2Ni1−xCux(x=0–0.4) Alloys. Chin J Mater Res, 2011, 25(4): 373-380.

Abstract References Related Articles Recommended Metrics Download:  PDF(1457KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The Mg2Ni1−xCux (x=0, 0.1, 0.2, 0.3, 0.4) hydrogen storage alloys have been prepared by melt-spinning technology. The structures of the as-cast and spun alloys are characterized by XRD, SEM and TEM. The gaseous hydrogen absorption and desorption kinetics of the alloys were measured by an automatically controlled Sieverts apparatus. The electrochemical hydrogen storage kinetics of the as-spun alloys is tested by an automatic galvanostatic system. The results show that all the as-spun alloys hold an entire nanocrystalline structure and are free of amorphous phase. The substitution of Cu for Ni, instead of changing the major phase Mg2Ni, leads to a visible refinement of the grains of the as-cast alloys. Furthermore, both the melt spinning treatment and Cu substitution significantly improve the gaseous and electrochemical hydrogen storage kinetics of the alloys. As the spinning rate increases from 0 (As-cast is defined as spinning rate of 0 m/s) to 30m/s, the hydrogen absorption saturation ratio in 5 min, for the Mg2Ni0.8Cu0.2alloy, increases from 56.7 to 92.7%, the hydrogen desorption ratio in 20 min from 14.9 to 40.4%, the high rate discharge ability from 38.5 to 75.5%, the hydrogen diffusion coefficient from 8.34×10-12cm2/s to 3.74×10-11cm2/s. Received:  17 November 2010      ZTFLH:  TB321   Fund:  Supported by National Nature Science Foundation of China Nos.50871050 & 50961009, Nature Science Foundation of Inner Mongolia No.2010ZD05. Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors ZHANG Yang-Huan REN Hui-Beng MA Zhi-Hong LI Xia ZHANG Guo-Fang DIAO Dong-Liang URL:  https://www.cjmr.org/EN/     OR     https://www.cjmr.org/EN/Y2011/V25/I4/373 1 I.P.Jain, C.Lal, A.Jain, Hydrogen storage in Mg: A most promising material, Int. J. 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