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Hydrogen storage properties of as-cast and annealed low-Co La1.8Ti0.2MgNi8.9Co0.1 alloys

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Abstract

Low-Co La1.8Ti0.2MgNi8.9Co0.1 alloys were prepared by magnetic levitation melting followed by annealing treatment. The effect of annealing on the hydrogen storage properties of the alloys was investigated systematically by X-ray diffraction (XRD), pressure-composition isotherm (PCI), and electrochemical measurements. The results show that all samples contain LaNi5 and LaMg2Ni9 phases. LaCo5 phase appears at 1,000 °C. The enthalpy change of all hydrides is close to −30.6 kJ·mol−1 H2 of LaNi5 compound. Annealing not only increases hydrogen capacity and improves cycling stability but also decreases plateau pressure at 800 and 900 °C. After annealing, the contraction of cell volume and the increase of hydride stability cause the high rate dischargeability to reduce slightly. The optimum alloy is found to be one annealed at 900 °C, with its hydrogen capacity reaching up to 1.53 wt%, and discharge capacity remaining 225.1 mAh·g−1 after 140 charge–discharge cycles.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Nos. 51071054 and 51271061), and the Natural Science Foundation of Guangxi (Nos. 2010GXNSFD013004 and 2012GXNSFBA053149).

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Authors and Affiliations

  1. College of Physics Science and Technology, Guangxi University, Nanning, 530004, China

    Wei-Qing Jiang, Jin Guo & Yin-Yan Wei

  2. School of Basic Medical Sciences, Youjiang Medical University for Nationalities, Baise, 533000, China

    Zheng-Cheng Zhou

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  1. Wei-Qing Jiang
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  2. Jin Guo
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  4. Yin-Yan Wei
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Correspondence to Wei-Qing Jiang.

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Jiang, WQ., Guo, J., Zhou, ZC. et al. Hydrogen storage properties of as-cast and annealed low-Co La1.8Ti0.2MgNi8.9Co0.1 alloys. Rare Met. 35, 559–565 (2016). https://doi.org/10.1007/s12598-014-0302-7

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