Effect of ball milling time on the hydrogen storage properties of TiF3-doped LiAlH4 |
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| Authors: | Shu-Sheng Liu Li-Xian Sun Yao Zhang Fen Xu Jian Zhang Hai-Liang Chu Mei-Qiang Fan Tao Zhang Xiao-Yan Song Jean Pierre Grolier |
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| Affiliation: | 1. Materials and Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning 116023, China;2. Faculty of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, China;3. Graduate School of Chinese Academy of Sciences, Beijing 100049, China;4. College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Chinese Education Ministry, Beijing University of Technology, Beijing 100124, China;5. Laboratory of Thermodynamics of Solutions and Polymers, Blaise Pascal University, 24 Avenue des Landais, 63177-Aubiere Cedex, France |
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| Abstract: | ![]()
In the present work, the catalytic effect of TiF3 on the dehydrogenation properties of LiAlH4 has been investigated. Decomposition of LiAlH4 occurs during ball milling in the presence of 4 mol% TiF3. Different ball milling times have been used, from 0.5 h to 18 h. With ball milling time increasing, the crystallite sizes of LiAlH4 get smaller (from 69 nm to 43 nm) and the dehydrogenation temperature becomes lower (from 80 °C to 60 °C). Half an hour ball milling makes the initial dehydrogenation temperature of doped LiAlH4 reduce to 80 °C, which is 70 °C lower than as-received LiAlH4. About 5.0 wt.% H2 can be released from TiF3-doped LiAlH4 after 18 h ball milling in the range of 60 °C–145 °C (heating rate 2 °C min−1). TiF3 probably reacts with LiAlH4 to form the catalyst, TiAl3. The mechanochemical and thermochemical reactions have been clarified. However, the rehydrogenation of LiAlH4/Li3AlH6 can not be realized under 95 bar H2 in the presence of TiF3 because of their thermodynamic properties. |
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| Keywords: | Hydrogen storage TiF3 LiAlH4 Ball milling time |
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