Effects of Fluoride Additives on the Hydrogen Storage Performance of 2LiBH4鈥揕i3AlH6 Destabilized System

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• 作者：Yun Li ; Xuezhang Xiao ; Lixin Chen ; Leyuan Han ; Jie Shao ; Xiulin Fan ; Shouquan Li ; Qidong Wang
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：October 25, 2012
• 年：2012
• 卷：116
• 期：42
• 页码：22226-22230
• 全文大小：361K
• 年卷期：v.116,no.42(October 25, 2012)
• ISSN：1932-7455

文摘

2LiBH₄鈥揕i₃AlH₆ composite samples doped with or without 5 wt % metal fluorides (CeF₃, NiF₂ and TiF₃) were prepared by ball milling, and the effects of fluoride additives on the hydrogen storage performance of the samples were comparatively investigated. It is found that the undoped 2LiBH₄鈥揕i₃AlH₆ system presents a favorable destabilized dehydrogenation performance as compared with the as-milled pure LiBH₄. The three fluorides can enhance the dehydriding kinetics of the 2LiBH₄鈥揕i₃AlH₆ destabilized system to some extent. The TiF₃-doped composite exhibits the most prominent behavior in terms of the low dehydrogenation temperature and fast dehydriding rate. The activation energy for the decomposition of LiBH₄ was measured by differential scanning calorimetry; that of the TiF₃ doped composite was calculated to be 118.3 kJ/mol, which is much lower than that of the undoped composite (197.6 kJ/mol). In addition, the experimental results show that the reversibility of the 2LiBH₄鈥揕i₃AlH₆ composite is improved by the doping of TiF₃, which plays a catalytic role, strengthens the interaction between LiBH₄ and Li₃AlH₆, and thus further improves the de/rehydrogenation performance.