J. Mater. Sci. Technol. ›› 2016, Vol. 32 ›› Issue (3): 218-225.DOI: 10.1016/j.jmst.2015.12.005

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Hydrogen Storage Kinetics of Nanocrystalline and Amorphous LaMg12-Type Alloy-Ni Composites Synthesized by Mechanical Milling

Yanghuan Zhang1, 2, Baowei Li1, Huiping Ren1, Tai Yang2, Shihai Guo2, Yan Qi2, Dongliang Zhao2   

  1. 1 Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China;
    2 Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081, China
  • 收稿日期:2015-09-02 修回日期:2015-11-11 出版日期:2016-03-10

Hydrogen Storage Kinetics of Nanocrystalline and Amorphous LaMg12-Type Alloy-Ni Composites Synthesized by Mechanical Milling

Yanghuan Zhang1, 2, Baowei Li1, Huiping Ren1, Tai Yang2, Shihai Guo2, Yan Qi2, Dongliang Zhao2   

  1. 1 Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China;
    2 Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081, China
  • Received:2015-09-02 Revised:2015-11-11 Online:2016-03-10
  • Contact: Prof., Ph.D.; Tel.: +86 10 62183115; Fax: +86 10 62187102.E-mail address: zhangyh59@sina.com (Y. Zhang).
  • Supported by:
    This work is financially supported by the National Natural Science Foundation of China (Grant Nos. 51161015 and 51371094).

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摘要： The nanocrystalline and amorphous LaMg11Ni + x wt% Ni (x = 100, 200) composites were synthesized by the mechanical milling, and their gaseous and electrochemical hydrogen storage kinetics performance were systematically investigated. The results indicate that the as-milled composites exhibit excellent hydrogen storage kinetic performances, and increasing Ni content significantly facilitates the improvement of the hydrogen storage kinetics properties of the composites. The gaseous and electrochemical hydrogen storage kinetics of the composites reaches a maximum value with the variation of milling time. Increasing Ni content and milling time both make the hydrogen desorption activation energy lower, which are responsible for the enhancement in the hydrogen storage kinetics properties of the composites. The diffusion coefficient of hydrogen atom and activation enthalpy of charge transfer on the surface of the as-milled composites were also calculated, which are considered to be the dominated factors for the electrochemical high rate discharge ability.

关键词: LaMg12 alloy, Mechanical milling, Activation energy, Hydrogen storage kinetics

Abstract: The nanocrystalline and amorphous LaMg11Ni + x wt% Ni (x = 100, 200) composites were synthesized by the mechanical milling, and their gaseous and electrochemical hydrogen storage kinetics performance were systematically investigated. The results indicate that the as-milled composites exhibit excellent hydrogen storage kinetic performances, and increasing Ni content significantly facilitates the improvement of the hydrogen storage kinetics properties of the composites. The gaseous and electrochemical hydrogen storage kinetics of the composites reaches a maximum value with the variation of milling time. Increasing Ni content and milling time both make the hydrogen desorption activation energy lower, which are responsible for the enhancement in the hydrogen storage kinetics properties of the composites. The diffusion coefficient of hydrogen atom and activation enthalpy of charge transfer on the surface of the as-milled composites were also calculated, which are considered to be the dominated factors for the electrochemical high rate discharge ability.

Key words: LaMg12 alloy, Mechanical milling, Activation energy, Hydrogen storage kinetics