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Hydrogen storage properties of La1.8Ti0.2MgNi9–x Co x (x = 0, 0.1, 0.3, 0.5) alloys

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Abstract

La1.8Ti0.2MgNi9–x Co x (x = 0, 0.1, 0.3, 0.5) alloys were prepared by magnetic levitation melting under argon atmosphere. The effects of Co substitution on the phase structure and the hydrogen storage properties of the alloys were investigated. The results show that LaNi5 and LaMg2Ni9 phases are contained in all experimental alloys. LaNi3 phase disappears and LaNi2 phase appears as x ≥ 0.1 and x ≥ 0.3, respectively. Electrochemical performances have been improved after Co substitution for Ni, for example, the discharge capacity and the high rate dischargeability (HRD) reach the maximum at x = 0.1, and the optimum cycling stability is obtained at x = 0.5. The positive impact of Co on the hydrogen diffusion rate in bulk enhances the HRD, but to high Co content (x ≥ 0.3), the unsatisfied hydrogen desorption capability brings relative low HRD compared with the alloy electrode at x = 0.1.

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Authors and Affiliations

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

    Weiqing Jiang, Jin Guo & Shilong Cao

  2. Guangxi Experiment Centre of Science and Technology, Guangxi University, Nanning, 530004, China

    Weiqing Jiang

  3. Guangxi Key Laboratory for Relativistic Astrophysics, Nanning, 530004, China

    Weiqing Jiang

Authors
  1. Weiqing Jiang
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  2. Jin Guo
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  3. Shilong Cao
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Correspondence to Weiqing Jiang.

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Published in Russian in Elektrokhimiya, 2016, Vol. 52, No. 5, pp. 491–496.

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Jiang, W., Guo, J. & Cao, S. Hydrogen storage properties of La1.8Ti0.2MgNi9–x Co x (x = 0, 0.1, 0.3, 0.5) alloys. Russ J Electrochem 52, 435–440 (2016). https://doi.org/10.1134/S1023193516050141

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  • DOI: https://doi.org/10.1134/S1023193516050141

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