Superior Destabilization Effects of MnF2 over MnCl2 in the Decomposition of LiBH4

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• 作者：Fang Fang ; Yongtao Li ; Yun Song ; Dalin Sun ; Qingan Zhang ; Liuzhang Ouyang ; Min Zhu
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：July 14, 2011
• 年：2011
• 卷：115
• 期：27
• 页码：13528-13533
• 全文大小：989K
• 年卷期：v.115,no.27(July 14, 2011)
• ISSN：1932-7455

文摘

A 3LiBH₄/MnF₂ composite was prepared by mechanically milling a mixture of LiBH₄ and MnF₂. The decomposition properties of the 3LiBH₄/MnF₂ composite were investigated and compared with those of the 3LiBH₄/MnCl₂ composite. Differing from the case for the 3LiBH₄/MnCl₂ composite where only cation substitution occurs, both the cation substitution of Mn²⁺ for Li⁺ and the anion substitution of F^{鈥?/sup> for H鈥?/sup> occur in the 3LiBH₄/MnF₂ composite. Moreover, compared to the 3LiBH₄/MnCl₂ composite, the 3LiBH₄/MnF₂ composite has a lower decomposition temperature, a higher purity of evolved hydrogen, and faster decomposition kinetics. These results suggest that MnF₂ has superior destabilization effects over MnCl₂ in the decomposition of LiBH₄, which can be attributed to the reduced stability of B鈥揌 bonds by partial anion substitution of the F鈥?/sup> for the H鈥?/sup>.}