Rehydrogenation and cycle studies of LiBH4–CaH2 composite
Rehydrogenation and cycle studies of LiBH4–CaH2 composite
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DOI：
10.1016/j.ijhydene.2010.04.046
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发表时间：
2010-07
影响因子：
7.2
通讯作者：
Jae-Hag Lim;J. Shim;Young-Su Lee;Jin-Yoo Suh;Y. Cho;Joonho Lee
中科院分区：
文献类型：
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作者：
Jae-Hag Lim;J. Shim;Young-Su Lee;Jin-Yoo Suh;Y. Cho;Joonho Lee
研究了含NbF5的6LiBH4+CaH_2复合材料在450℃脱氢后在350~500℃范围内的二次加氢行为，该复合材料在450℃时表现出最佳的再加氢性能。结果表明，该复合材料在450℃下吸氢12h，吸氢量约为9wt%，共进行了10次脱氢-加氢循环。结果表明，含15wt%NbF5的6LiBH4+CaH_2在450℃下的可逆储氢容量在第1~5次循环之间略有下降后，仍保持在6wt%左右。NbF5的加入似乎通过抑制循环过程中的组织粗化而改善了循环性能。
Rehydrogenation behavior of 6LiBH4+ CaH2composite with NbF5has been studied between 350 and 500 °C after dehydrogenation at 450 °C. The composite exhibits the best rehydrogenation feature at 450 °C in terms of the overall rehydrogenation rate and the amount of absorbed hydrogen. It is found that about 9 wt% hydrogen is absorbed at 450 °C for 12 h. Up to 10 dehydrogenation–hydrogenation cycles have been carried out for the composite. It is demonstrated that 6LiBH4+ CaH2with 15 wt% NbF5maintains a reversible hydrogen storage capacity of about 6 wt% at 450 °C after a slight degradation between the 1st and 5th cycles. The addition of NbF5seems to improve the cycle properties by retarding microstructural coarsening during cycles.