Ultra-fast dehydrogenation behavior at low temperature of LiAlH4 modified by fluorographite

• Published in: International journal of hydrogen energy Vol. 45; no. 52; pp. 28123 - 28133
• Main Authors: Cheng, Hao, Zheng, Jiaguang, Xiao, Xuezhang, Liu, Zhe, Ren, Xiujuan, Wang, Xuancheng, Li, Shouquan, Chen, Lixin
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 23.10.2020
• Subjects: Destabilization; Fluorographite; Hydrogen storage; LiAlH4; Hydrogen storage; LiAlH4; Destabilization; Fluorographite
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2020.03.186

LiAlH4 modified by different weight ratios of fluorographite (FGi) can be synthesized through mechanical ball-milling and their dehydrogenation behaviors were investigated. LiAlH4 particles distributed on the FGi surface with greatly decreased sizes are achieved, comparing with ball-milled pristine LiAlH4. Greatly reduced dehydrogenation temperatures are discovered in LiAlH4-FGi composites. Among these composites, LiAlH4-40FGi composite exhibits an ultra-fast hydrogen release at very low temperature as 61.2 °C, and 5.7 wt% hydrogen is liberated in seconds. Besides, the released hydrogen is of high purity according to MS test. Furthermore, XRD analysis on the dehydrogenated products proves that FGi changes the dehydrogenation reaction pathway of LiAlH4, through which the dehydrogenation reaction enthalpy change is remarkably reduced, leading to greatly improved hydrogen desorption properties. Such investigations have discovered the potential of solid-state way of producing hydrogen under ambient temperatures. •Nanoscale LiAlH4 particles are found scattered on FGi surface after milling.•5.7 wt% hydrogen could be liberated in seconds at 61.2 °C for LiAlH4-40FGi composite.•The decreased reaction enthalpy change in LiAlH4-FGi composites lead to the improved dehydrogenation.