Improvement of hydrogen-storage properties of MgH2 by addition of Li3N, LiBH4, Fe and/or Ti
Improvement of hydrogen-storage properties of MgH2 by addition of Li3N, LiBH4, Fe and/or Ti
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DOI：
10.1016/j.materresbull.2012.10.007
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发表时间：
2013
影响因子：
5.4
通讯作者：
M. Song;S. Kwon;Y. Kwak;H. Park
中科院分区：
文献类型：
--
作者：
M. Song;S. Kwon;Y. Kwak;H. Park
为了提高MgH 2基材料的储氢容量，添加Li 3 N、LiBH 4、Fe和/或Ti。采用反应机械研磨法制备了50 MgH 2 - 50 Li 3 N、40 Mg-10 MgH 2 - 50 Li 3 N、68 MgH 2 - 17 LiBH 4 - 15 Fe和70 MgH 2 - 17 LiBH 4 - 13 Ti混合物，并对其储氢性能进行了研究。40 Mg-10 MgH 2 - 50 Li 3 N在双氢-脱氢循环后含有Mg3 N2、LiMgN、LiOH和MgO、LiH和NH3·2 H2O，表明反应为6 Mg +4 MgH 2 + 4Li 3 N +23 H2O → Mg3 N2 +LiMgN+11 LiOH +3 NH3·2 H2O +6 MgO +7 H2。70 MgH 2 - 17 LiBH 4 - 13 Ti在双氢-脱氢循环后含有MgH 2、TiH 1.924、Mg和MgO。在所研究的样品中，70MgH_2 - 17LiBH_4 - 13 Ti在开始阶段的包覆率最高。球磨态70 MgH 2 - 17 LiBH 4 - 13 Ti样品在573 K和12 bar H2下5分钟吸收3.33wt%的H，10分钟吸收3.83wt%的H，60分钟吸收3.94wt%的H。
In order to increase hydrogen storage capacity of MgH2-based materials, Li3N, LiBH4, Fe, and/or Ti were added. Mixtures with compositions of 50MgH2–50Li3N, 40Mg–10MgH2–50Li3N, 68MgH2–17LiBH4–15Fe, and 70MgH2–17LiBH4–13Ti were prepared by reactive mechanical grinding and their hydrogen-storage properties were examined. 40Mg–10MgH2–50Li3N after hydriding–dehydriding cycling contains Mg3N2, LiMgN, LiOH, and MgO, LiH, and NH3·2H2O, suggesting a reaction of 6Mg+4MgH2+4Li3N+23H2O→Mg3N2+LiMgN+11LiOH+3NH3·2H2O+6MgO+7H2. 70MgH2–17LiBH4–13Ti after hydriding–dehydriding cycling contained MgH2, TiH1.924, Mg, and MgO. Among the samples studied, 70MgH2–17LiBH4–13Ti had the highest hydriding rate in the beginning. The as-milled 70MgH2–17LiBH4–13Ti sample absorbed 3.33wt% H for 5min, 3.83wt% H for 10min, and 3.94wt% H for 60min at 573K under 12bar H2.