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首页> 外文期刊>Advanced Functional Materials >Lithium-catalyzed Dehydrogenation Of Ammonia Borane Within Mesoporous Carbon Framework For Chemical Hydrogen Storage
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Lithium-catalyzed Dehydrogenation Of Ammonia Borane Within Mesoporous Carbon Framework For Chemical Hydrogen Storage

机译：锂催化介孔碳骨架内氨硼烷的脱氢反应

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摘要

Ammonia borane (AB) has attracted tremendous interest for on-board hydrogen storage due to its low molecular weight and high gravimetric hydrogen capacity below a moderate temperature. However, the slow kinetics, irreversibility, and formation of volatile materials (trace borazine and ammonia) limit its practical application. In this paper, a new catalytic strategy involved lithium (Li) catalysis and nanostructure confinement in mesoporous carbon (CMK-3) for the thermal decomposition of AB is developed. AB loaded on the 5% Li/CMK-3 framework releases ～7wt % of hydrogen at a very low temperature (around 60 ℃) and entirely suppresses borazine and ammonia emissions that are harmful for proton exchange membrane fuel cells. The possible mechanism for enhanced hydrogen release via catalyzed thermal decomposition of AB is discussed.
机译：氨硼烷（AB）由于分子量低且在中等温度下具有较高的重量氢容量，因此对车载氢存储引起了极大的兴趣。但是，缓慢的动力学，不可逆性和挥发性物质（痕量硼嗪和氨气）的形成限制了其实际应用。本文提出了一种新的催化策略，包括锂（Li）催化和介孔碳（CMK-3）中的纳米结构限制，以实现AB的热分解。负载在5％Li / CMK-3骨架上的AB在非常低的温度（约60℃）下释放约7wt％的氢，并完全抑制了对质子交换膜燃料电池有害的硼嗪和氨气排放。讨论了通过AB的催化热分解提高氢释放的可能机理。

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