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

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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.

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Authors and Affiliations

  1. The School of Rare Earth, Inner Mongolia University of Science and Technology, Baotou, 014010, China

    Feng Hu, Yin Zhang, Ying Cai, Jianyi Xu & Zhonghui Hou

  2. Elected State Key Laboratory, Inner Mongolia University of Science and Technology, Baotou, 014010, China

    Yanghuan Zhang

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  1. Feng Hu
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Correspondence to Feng Hu.

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Hu, F., Zhang, Y., Zhang, Y. et al. Electrochemical and kinetic study of as-cast and as-quench Mg2Ni-type hydrogen storage alloys. Journal of Materials Research 28, 2701–2708 (2013). https://doi.org/10.1557/jmr.2013.258

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