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Improvement of the hydrogen-storage performances of Li–Mg–N–H system

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Abstract

Li2MgN2H2 can reversibly store more than 5.5 wt% hydrogen. However, the high activation energy of hydrogen desorption poses a kinetic barrier for low-temperature operation. In this work, the composition of the Li–Mg–N–H system has been modified by the partial substitution of Mg or Li by Na. The changes in structure and hydrogen absorption/desorption kinetics have been investigated. It was found that the peak temperature for hydrogen desorption was decreased by ≈10 °C, and that the hydrogen absorption/desorption isotherms were also significantly changed. Furthermore, the activation energy calculated by the Kissinger’s approach was reduced after the substitution of Mg or Li by Na. In addition, the different dehydrogenation structures were detected at different molar ratios of Mg, Li, and Na.

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Authors and Affiliations

  1. Department of Physics, National University of Singapore, Singapore, 117542, Singapore

    Yongfeng Liu, Jianjiang Hu, Zhitao Xiong, Guotao Wu & Ping Chen

  2. Department of Chemistry, National University of Singapore, Singapore, 117543, Singapore

    Ping Chen

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  1. Yongfeng Liu
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  2. Jianjiang Hu
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  3. Zhitao Xiong
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  4. Guotao Wu
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  5. Ping Chen
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Correspondence to Ping Chen.

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This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/jmr_policy.

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Liu, Y., Hu, J., Xiong, Z. et al. Improvement of the hydrogen-storage performances of Li–Mg–N–H system. Journal of Materials Research 22, 1339–1345 (2007). https://doi.org/10.1557/jmr.2007.0165

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  • DOI: https://doi.org/10.1557/jmr.2007.0165

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