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首页> 外文期刊>Nanotechnology >The kinetic enhancement of hydrogen cycling in NaAlH_4 by melt infusion into nanoporous carbon aerogel
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The kinetic enhancement of hydrogen cycling in NaAlH_4 by melt infusion into nanoporous carbon aerogel

机译：熔融注入纳米多孔碳气凝胶中，NaAlH_4中氢循环的动力学增强

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摘要

Enhanced kinetic performance and reversibility have been achieved with uncatalyzed NaAlH_4 by incorporation into nanoporous carbon aerogel. Aerogel with a pore size distribution peaked at 13 nm and a pore volume of 0.8 cm~3 g~(-1) was filled with NaAlH_4 to 94% capacity by melt infusion at 189 ℃ under 183 bar H_2 gas overpressure. Dehydrogenation to NaH + Al with reasonable kinetics was accomplished at 150 ℃, well below the NaAlH_4 melting temperature (183 ℃), compared to hydrogen release above 230 __ for bulk uncatalyzed NaAlH_4. Uncatalyzed bulk samples did not rehydrogenate under laboratory conditions, whereas NaAlH_4 in a carbon aerogel host was readily rehydrogenated at ～160 ℃and 100 bar H_2 to ～85% of its initial capacity. Ball-milled NaAlH_4 catalyzed with 4 mol% TiCl_3 showed somewhat better kinetics compared to the infused aerogel; nevertheless, the large kinetic enhancement obtained by incorporation into carbon aerogel, even in the absence of a catalyst, demonstrates the substantial benefit of confining the NaAlH_4 to nanoscale dimensions.
机译：通过掺入纳米多孔碳气凝胶，未催化的NaAlH_4可以实现增强的动力学性能和可逆性。通过在183 bar H_2气体超压下于189℃熔融注入NaAlH_4至94％的容量，将孔径分布在13 nm处达到峰值且孔体积为0.8 cm〜3 g〜（-1）的气凝胶填充。在150℃达到了合理的动力学脱氢为NaH + Al，远低于NaAlH_4的熔融温度（183℃），而大量未催化的NaAlH_4的氢释放高于230℃。未催化的大块样品在实验室条件下不会再氢化，而碳气凝胶主体中的NaAlH_4则很容易在〜160℃和100 bar H_2下再氢化至初始容量的〜85％。与注入的气凝胶相比，用4 mol％TiCl_3催化的球磨NaAlH_4表现出更好的动力学。然而，即使在没有催化剂的情况下，通过掺入碳气凝胶所获得的大的动力学增强也显示出将NaAlH 4限制在纳米尺度上的实质益处。

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