Effect of gas back pressure on hydrogen storage properties and crystal structures of Li2Mg(NH)2 |
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| Authors: | Chu Liang Mingxia Gao Hongge Pan Yongfeng Liu Mi Yan |
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| Affiliation: | 1. College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, People''s Republic of China;2. State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province & Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People''s Republic of China |
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| Abstract: | The ternary imide Li2Mg(NH)2 is considered to be one of the most promising on-board hydrogen storage materials due to its high reversible hydrogen capacity of 5.86 wt%, favorable thermodynamic properties and good cycling stability. In this work, Li2Mg(NH)2 was synthesized by dynamically dehydrogenating a mixture of Mg(NH2)2–2LiH up to 280 °C under different gas (Ar and H2) and pressures (0–9.0 bar). The crystal structure of Li2Mg(NH)2 was found to depend on the gas back pressure in the dehydrogenation process. The crystal structure of Li2Mg(NH)2 and the dehydrogenation/rehydrogenation properties of the Mg(NH2)2–2LiH system strongly depend on the gas back pressure in the dehydrogenation process due to the effect of the pressure on the dehydrogenation kinetics. This study provides a new approach for improving the hydrogen storage properties of the amide–hydride systems. |
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| Keywords: | Hydrogen storage Imide Crystal structure Kinetics Thermodynamics |
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