Controlling the Decomposition Pathway of LiBH4 via Confinement in Highly Ordered Nanoporous Carbon

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• 作者：Xiangfeng Liu ; David Peaslee ; C. Z. Jost ; E. H. Majzoub
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：August 26, 2010
• 年：2010
• 卷：114
• 期：33
• 页码：14036-14041
• 全文大小：241K
• 年卷期：v.114,no.33(August 26, 2010)
• ISSN：1932-7455

文摘

The wetting and decomposition behavior of LiBH₄ has been investigated in the presence of highly ordered nanoporous hard carbon (NPC) with hexagonally packed 2 nm diameter columnar pores. Calorimetry, X-ray diffraction, and IR spectroscopy measurements confirm that the LiBH₄ within the pores is amorphous. The confinement of LiBH₄ in such small pores results in the disappearance of the low-temperature structural phase transition, the melting transition, and also the significant decrease of the onset desorption temperature from 460 to 220 °C with respect to bulk LiBH₄, a lower temperature than observed in larger pore sizes in the literature. Most importantly, our results suggest that diborane release is suppressed or eliminated in the decomposition of noncrystalline LiBH₄. Tight nanoconfinement may therefore mitigate both safety concerns and loss of active material in borohydride-based hydrogen storage systems.