Hydrogen storage properties of the mixtures MgH2–Li3N with different molar ratios

Hydrogen storage properties of the mixtures MgH2–Li3N with different molar ratios
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不同摩尔比的MgH2-Li3N混合物的储氢性能

DOI:
10.1016/j.jallcom.2014.12.081
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发表时间:
2015-10
影响因子:
6.2
通讯作者:
Ying Wu
Ying Wu
中科院分区:
材料科学2区
文献类型:
--
作者:
Bao Zhang;Wei Li;YuJie Lv;Youhua Yan;Ying Wu

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LiMgN,具有8.2重量%的理论重量氢容量,是一种很有前途的储氢材料。采用球磨法制备了不同摩尔比的MgH 2-xLi 3 N(x= 0.5,1,2)混合物,以获得大量的LiMgN。这表明,较高的Li 3 N含量有利于LiMgN的形成。XRD分析表明,随着MgH 2和Li 3 N的摩尔比的变化,相组成发生变化。在MgH 2 -0.5Li3N混合物中,Mg3 N2、MgH 2和LiH相的存在,而在MgH 2-(1,2)Li 3 N混合物中,LiMgN和LiH相的存在。用Sieverts型储氢装置研究了所制备的混合物的储氢性能。采用粉末XRD和FTIR表征了加氢/脱氢过程中产物的相结构。对加氢/脱氢过程中的反应机理进行了讨论。
LiMgN, with a theoretical gravimetric hydrogen capacity of 8.2 wt.%, is one of the promising hydrogen storage materials. Different molar ratios of MgH2–xLi3N (x= 0.5, 1, 2) mixtures were prepared by ball milling in order to obtain large amount of LiMgN. It reveals that the higher content of Li3N is effective for the formation of LiMgN. XRD patterns show that the constituents of the phases are changed with molar ratios of MgH2and Li3N. The phases of Mg3N2, MgH2and LiH are obtained in the MgH2–0.5Li3N mixture, but, LiMgN and LiH phases are detected in the MgH2–(1, 2) Li3N mixtures. The hydrogen storage properties of the as-prepared mixtures were studied by a Sieverts’-type apparatus. Powder XRD and FTIR measurements were used to identify the phase structures of the products during the hydrogenation/dehydrogenation process. The reaction mechanisms during the hydrogenation/dehydrogenation process are discussed.
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