Role of Early-Stage Atmosphere in the Dehydrogenation Reaction of the LiBH4鈥揧H3 Composite

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• 作者：Kee-Bum Kim ; Jae-Hyeok Shim ; Kyu Hwan Oh ; Young Whan Cho
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：April 25, 2013
• 年：2013
• 卷：117
• 期：16
• 页码：8028-8031
• 全文大小：310K
• 年卷期：v.117,no.16(April 25, 2013)
• ISSN：1932-7455

文摘

This article investigates the dehydrogenation behavior of the LiBH₄鈥揧H₃ composite under various early-stage Ar back-pressure conditions. It is clearly observed that a minute change in early-stage atmosphere greatly affects the overall dehydrogenation reaction of the composite. Free boron and Li₂B₁₂H₁₂ start to form in turn as the partial dehydrogenation products around 400 掳C under static vacuum or low Ar back pressure. The formation of Li₂B₁₂H₁₂ greatly increases the activation energy for the dehydrogenation reaction between LiBH₄ and YH₃ into LiH and YB₄, hence significantly retarding the reaction. The formation of B just slightly increases the incubation period of the reaction. The formation of Li₂B₁₂H₁₂ is effectively suppressed by initially applying Ar back pressure above 0.1 MPa.