Enhancement of the H₂ desorption properties of LiAlH₄ doping with NiCo₂O₄ nanorods

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• 作者：Li Li ; Cuihua An ; Ying Wang ; Yanan Xu ; Fangyuan Qiu ; Yijing Wang ; ^{wangyj@nankai.edu.cn" class="auth_mail} ; Lifang Jiao ; Huatang Yuan
• 关键词：Hydrogen storage ; LiAlH4 ; NiCo2O4 ; Dehydrogenation
• 刊名：International Journal of Hydrogen Energy
• 出版年：18 March, 2014
• 年：2014
• 卷：39
• 期：9
• 页码：4414-4420
• 全文大小：1986 K

文摘

Lithium aluminum hydride (LiAlH₄) is considered as an attractive candidate for hydrogen storage owing to its favorable thermodynamics and high hydrogen storage capacity. However, its reaction kinetics and thermodynamics have to be improved for the practical application. In our present work, we have systematically investigated the effect of NiCo₂O₄ (NCO) additive on the dehydrogenation properties and microstructure refinement in LiAlH₄. The dehydrogenation kinetics of LiAlH₄ can be significantly increased with the increase of NiCo₂O₄ content and dehydrogenation temperature. The 2聽mol% NiCo₂O₄-doped LiAlH₄ (2% NCO-LiAlH₄) exhibits the superior dehydrogenation performances, which releases 4.95聽wt% H₂ at 130聽掳C and 6.47聽wt% H₂ at 150聽掳C within 150聽min. In contrast, the undoped LiAlH₄ sample just releases <1聽wt% H₂ after 150聽min. About 3.7聽wt.% of hydrogen can be released from 2% NCO-LiAlH₄ at 90聽掳C, where total 7.10聽wt% of hydrogen is released at 150聽掳C. Moreover, 2% NCO-LiAlH₄ displayed remarkably reduced activation energy for the dehydrogenation of LiAlH₄.