Superior dehydrogenation performance of nanoscale lithium borohydride modified with fluorographite

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• 作者：Liuting Zhang ; Lixin Chen ; Xuezhang Xiao ; Zhiwen Chen ; Shunkui Wang ; Xiulin Fan ; Shouquan Li ; Hongwei Ge ; Qidong Wang
• 关键词：Hydrogen storage ; LiBH4 ; Fluorographite ; Nano-modifying
• 刊名：International Journal of Hydrogen Energy
• 出版年：13 January, 2014
• 年：2014
• 卷：39
• 期：2
• 页码：896-904
• 全文大小：2123 K

文摘

A significant enhancement in the dehydrogenation performance of LiBH₄ is achieved by modifying with fluorographite (FGi). In-depth investigations show that the dehydrogenation thermodynamics and kinetics of LiBH₄ are strongly improved by ball milling LiBH₄ with FGi. The ball-milled LiBH₄-FGi (mass ratio of 1:1) composite starts to release hydrogen without impurity gas at around 180聽掳C, and obtains a hydrogen desorption capacity of 7.2聽wt% below 200聽掳C in seconds, which is improved dramatically compared with pristine ball-milled LiBH₄. Microscopic morphology indicates that numerous 鈭?0聽nm spots formed on the surface of FGi. Based on the microstructure analyses combined with hydrogen storage performances, the prominent effect of FGi is largely attributed to the nano-modifying effect and the exothermic reaction between LiBH₄ and FGi during the dehydrogenation process. Furthermore, partial reversibility of the LiBH₄-FGi composite has been demonstrated and the mechanism underlying the cycling capacity loss is discussed. The use of FGi may shed light on future study on searching for new strategies to improve both the thermodynamics and kinetics of light-metal complex hydrides.