Significantly improved dehydrogenation of LiAlH4 destabilized by K2TiF6 |
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| Authors: | Zhibao Li Shusheng Liu Xiaoliang Si Jian Zhang Chengli Jiao Shuang Wang Shuang Liu Yong-Jin Zou Lixian Sun Fen Xu |
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| Affiliation: | 1. Materials and Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, PR China;2. Graduate School of the Chinese Academy of Sciences, Beijing 100049, PR China;3. Faculty of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, PR China;4. Department of Material Science & Engineering, Guilin University of Electrical Technology, Guilin 541004, China |
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| Abstract: | The effects of K2TiF6 on the dehydrogenation properties of LiAlH4 were investigated by solid-state ball milling. The onset decomposition temperature of 0.8 mol% K2TiF6 doped LiAlH4 is as low as 65 °C that 85 °C lower than that of pristine LiAlH4. Isothermal dehydrogenation properties of the doped LiAlH4 were studied by PCT (pressure–composition–temperature). The results show that, for the 0.8 mol% K2TiF6 doped LiAlH4 that dehydrogenated at 90 °C, 4.4 wt% and 6.0 wt% of hydrogen can be released in 60 min and 300 min, respectively. When temperature was increased to 120 °C, the doped LiAlH4 can finish its first two dehydrogenation steps in 170 min. DSC results show that the apparent activation energy (Ea) for the first two dehydrogenation steps of LiAlH4 are both reduced, and XRD results suggest that TiH2, Al3Ti, LiF and KH are in situ formed, which are responsible for the improved dehydrogenation properties of LiAlH4. |
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| Keywords: | K2TiF6 LiAlH4 Catalysis Complex hydride Hydrogen storage |
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