Significantly improved dehydrogenation of LiBH4 destabilized by TiF3

被引：110

作者：

Guo, Y. H. ^{[1
]}

Yu, X. B. ^{[1
,2
]}

Gao, L. ^{[1
]}

Xia, G. L. ^{[1
]}

Guo, Z. P. ^{[2
]}

Liu, H. K. ^{[2
]}

机构：

[1] Fudan Univ, Dept Mat Sci, Shanghai 200433, Peoples R China

[2] Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2522, Australia

来源：

ENERGY & ENVIRONMENTAL SCIENCE | 2010年 / 3卷 / 04期

基金：

澳大利亚研究理事会;

关键词：

HYDROGEN-STORAGE; MG; REVERSIBILITY; MAGNESIUM; STABILITY; TITANIUM; HYDRIDES;

D O I：

10.1039/b915779d

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The hydrogen storage properties of LiBH4 ball milled with TiF3 were investigated. It was found that the LiBH4-TiF3 mixture exhibited significantly improved dehydrogenation properties. For example, the LiBH4-TiF3 (mole ratio: 3 : 1) sample started to release hydrogen at around 100 degrees C, and the hydrogen desorption capacity reached 5.0 wt% at 250 degrees C. Furthermore, the dehydrogenated product can be partially rehydrogenated at 100 atm H-2 and 350 degrees C. X-Ray diffraction (XRD), infrared (IR) spectroscopy and X-ray photoelectron spectroscopy (XPS) characterizations revealed that the decreased dehydrogenation conditions in the LiBH4-TiF3 system resulted from an exothermic reaction of 3LiBH(4) + TiF3 -> 3LiF + TiB2 + B + 6H(2), which improved both its thermodynamics and kinetics. As the above reaction is exothermic, the reverse reaction is not feasible, further investigations indicated that the rehydrogenation may be due to the formation of another borohydride.

引用

页码：465 / 470

页数：6

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