Hydrogen absorption–desorption mechanisms for the ball-milled Li3N–MgH2 (1:1) mixture
Hydrogen absorption–desorption mechanisms for the ball-milled Li3N–MgH2 (1:1) mixture
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DOI：
10.1016/j.ijhydene.2014.02.153
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发表时间：
2014-08
影响因子：
7.2
通讯作者：
Bao-Hua Zhang;Ying Wu
中科院分区：
文献类型：
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作者：
Bao-Hua Zhang;Ying Wu
Li-Mg-N-H系储氢材料具有容量大、可逆性好、操作条件温和等优点，是一种很有前途的储氢材料。在本工作中，通过Li3N+→+LiMgN+2LiH的反应，以1：1的摩尔比球磨Li3N-MgH_2的混合物，直接合成了LiMgN/2LiH。用Sieverts装置研究了制备的LiMgN/2LiH的加氢/脱氢性能。LiMgN/2LiH混合物在130℃开始吸氢，在5和10℃的压力下，吸氢量分别为2.2wt%和3.2wt%。用粉末X射线衍射(XRD)和傅立叶变换红外光谱(FTIR)表征了产物吸放氢过程中的物相组成。讨论了Li3N-MgH_2体系加氢/脱氢过程中的反应机理。
The Li–Mg–N–H system is a very promising hydrogen storage material due to its high capacity, reversibility and moderate operating conditions. In this work, the LiMgN/2LiH was directly synthesized by ball-milling the mixture of Li3N–MgH2at 1:1 molar ratio by a reaction of Li3N + MgH2→ LiMgN + 2LiH. The hydrogenation/dehydrogenation properties of the as-prepared LiMgN/2LiH were investigated by a Sieverts'-type apparatus. The mixture of LiMgN/2LiH started to absorb hydrogen at 130 °C, and 2.2 wt%, 3.2 wt% hydrogen were absorbed under a pressure of 5 MPa and 10 MPa, respectively. Powder X-ray Diffraction (XRD) and Fourier Transform Infrared (FTIR) spectrometer measurements were used to identify the phase characterizations of the products during the hydrogen absorption–desorption process. The reaction mechanism during the hydrogenation/dehydrogenation process for the Li3N–MgH2system is discussed.