Alkali Metal Hydride Modification on Hydrazine Borane for Improved Dehydrogenation

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• 作者：Yong Shen Chua ; Qijun Pei ; Xiaohua Ju ; Wei Zhou ; Terrence J. Udovic ; Guotao Wu ; Zhitao Xiong ; Ping Chen ; Hui Wu
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：May 29, 2014
• 年：2014
• 卷：118
• 期：21
• 页码：11244-11251
• 全文大小：364K
• 年卷期：v.118,no.21(May 29, 2014)
• ISSN：1932-7455

文摘

Hydrazidotrihydridoborates of various alkali metals, i.e., NaN₂H₃BH₃ and KN₂H₃BH₃, were synthesized successfully via a liquid approach. The crystal structures of NaN₂H₃BH₃ and KN₂H₃BH₃ were determined, and their dehydrogenation properties were compared with LiN₂H₃BH₃ and N₂H₄BH₃. A clear correlation between sizes of metal cations in hydrazidotrihydridoborates and their corresponding melting and dehydrogenation temperatures was observed. The dehydrogenation temperature was found dependent on the melting temperature. Upon approaching the melting points, alkali metal hydrazidotrihydridoborates dehydrogenate rapidly in the first step, giving rise to the formation of intermediates that possess N₂BH₂, N₂BH, and NBH₃ species. Further increasing temperature leads to the release of additional H₂ and the formation of N₂BH species. Compared to pristine N₂H₄BH₃, the alkali-metal-substituted hydrazidotrihydridoborates demonstrate significantly improved dehydrogenation behavior with no N₂H₄ emission and greatly suppressed NH₃ release.