Synthesis and dehydrogenation of LiCa(NH₂)₃(BH₃)₂

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• 作者：Bin Liu^a ; ^b ; Yong Shen Chua^b ; Guotao Wu^b ; Zhitao Xiong^b ; Ping Chen^b ; ^{pchen@dicp.ac.cn}
• 关键词：Calcium amidoborane ; Lithium amide ; LiCa(NH2)3(BH3)2 ; Dehydrogenation
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：June, 2012
• 卷：37
• 期：11
• 页码：9076-9081
• 文件大小：549 K

摘要

We report the synthesis of a new hydrogen storage material with a composition of LiCa(NH₂)₃(BH₃)₂. The theoretical hydrogen capacity of LiCa(NH₂)₃(BH₃)₂ is 9.85聽wt.%. It can be prepared by ball milling the mixture of calcium amidoborane (Ca(NH₂BH₃)₂) and lithium amide (LiNH₂) in a molar ratio of 1:1. The experimental results show that this material starts to release hydrogen at a temperature as low as ca. 50聽掳C, which is ca. 70聽掳C lower than that of pure Ca(NH₂BH₃)₂ possibly resulting from the active interaction of NH₂^{鈭?/sup> in LiNH₂ with BH₃ in Ca(NH₂BH₃)₂. ca. 4.1 equiv. or 6.8聽wt.%hydrogen can be released at 300聽掳C. The dehydrogenation is a mildly exothermic process forming stable nitride products.}