Feasibility and performance of the mixture of MgH2 and LiNH2 (1:1) as a hydrogen-storage material
Feasibility and performance of the mixture of MgH2 and LiNH2 (1:1) as a hydrogen-storage material
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DOI：
10.1016/j.actamat.2011.05.059
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发表时间：
2011-08
期刊：
影响因子：
9.4
通讯作者：
J. Hu;E. Röhm;M. Fichtner
中科院分区：
文献类型：
--
作者：
J. Hu;E. Röhm;M. Fichtner
当MgH 2和LiNH 2的摩尔比为1：1时，H在温和条件下。MgH_2-LiNH_2二元混合物经机械球磨后，由于初始组分间的复分解反应，形成了多元复合体系。发现该体系的脱氢反应是通过复分解生成LiH和Mg（NH 2）2而开始的。在这项工作中研究的氢吸附性能显示了强烈的影响，确定随后的脱氢途径的球磨参数。适当的球磨有利于氢的释放，而不充分的球磨导致缓慢的氢解吸和严重的NH3排放。在形成三元氮化物LiMgN的情况下获得了7.3%的最大量;然而，必须应用高达600°C的解吸温度。
A 1:1molar ratio mixture of MgH2and LiNH2was predicted to release 8.1wt.% H under moderate conditions. This binary mixture of MgH2–LiNH2was found to be a multinary complex system induced by mechanical ball milling, due to the metathesis reaction between the initial components. It was found that dehydrogenation from this system was initialized by the formation of LiH and Mg(NH2)2via such metathesis. The hydrogen sorption performance studied in this work shows a strong influence of the ball-milling parameters which determine the subsequent dehydrogenation pathways. An adequate ball milling facilitates hydrogen release, whereas insufficient milling results in a sluggish hydrogen desorption and severe NH3emission. A maximum amount of 7.3% was obtained with formation of the ternary nitride LiMgN; however, desorption temperatures of up to 600°C had to be applied.