Liu Haizhen, Ma Hongyu, Zhang Longfei, Gao Shichao, Wang Xinhua, Xu Li, Liu Shuangyu, Huang Xiantun, Lu Chenglin, Luo Hui, Ning Hua, Lan Zhiqiang, Guo Jin
Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology, Guangxi Novel Battery Materials Research Center of Engineering Technology, School of Physical Science and Technology, Guangxi University, Nanning, China.
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, China.
Front Chem. 2020 Jan 15;7:892. doi: 10.3389/fchem.2019.00892. eCollection 2019.
Aluminum hydride (AlH) is a promising candidate for hydrogen storage due to its high hydrogen density of 10 wt%. Several polymorphs of AlH (e.g., α, β, and γ) have been successfully synthesized by wet chemical reaction of LiAlH and AlCl in ether solution followed by desolvation. However, the synthesis process of α'-AlH from wet chemicals still remains unclear. In the present work, α'-AlH was synthesized first by the formation of the etherate AlH through a reaction of LiAlH and AlCl in ether solution. Then, the etherate AlH was heated at 60°C under an ether gas atmosphere and in the presence of excess LiAlH to remove the ether ligand. Finally, α'-AlH was obtained by ether washing to remove the excess LiAlH. It is suggested that the desolvation of the etherate AlH under an ether gas atmosphere is essential for the formation of α'-AlH from the etherate AlH. The as-synthesized α'-AlH takes the form of rod-like particles and can release 7.7 wt% hydrogen in the temperature range 120-200°C.
氢化铝（AlH）因其10 wt%的高氢密度而成为一种很有前景的储氢材料。通过在醚溶液中LiAlH与AlCl进行湿化学反应然后脱溶剂，已成功合成了几种AlH的多晶型物（例如α、β和γ）。然而，由湿化学法合成α'-AlH的过程仍不清楚。在本工作中，首先通过在醚溶液中LiAlH与AlCl反应形成醚合物AlH来合成α'-AlH。然后，将醚合物AlH在醚气气氛下、60°C温度以及过量LiAlH存在的条件下加热以去除醚配体。最后，通过醚洗去除过量的LiAlH得到α'-AlH。结果表明，醚合物AlH在醚气气氛下脱溶剂对于从醚合物AlH形成α'-AlH至关重要。合成的α'-AlH呈棒状颗粒形式，在120 - 200°C温度范围内可释放7.7 wt%的氢。
