Destabilization of LiBH4 by SrF2 for reversible hydrogen storage |
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| Authors: | SX Zhao CY Wang DM Liu QJ Tan YT Li TZ Si |
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| Affiliation: | School of Materials Science and Engineering, Anhui University of Technology, Maanshan, Anhui 243002, PR China |
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| Abstract: | The de-/rehydrogenation features of the 6LiBH4/SrF2 reactive hydride system have been systematically investigated. It was found that the thermal stability of LiBH4 can be reduced markedly by combining it with SrF2. Dehydrogenation of the 6LiBH4/SrF2 system proceeds via the 6LiBH4 + SrF2 → SrB6 + 2LiF + 4LiH + 10H2 reaction, which involves SrH2 as the intermediate product. The dehydrogenation enthalpy change was experimentally determined to be 52 kJ/mol H2 based on the P–C isotherm analysis. For rehydrogenation, LiBH4 and SrF2 were regenerated along with LiSrH3 at 450 °C under ～8 MPa hydrogen pressure; thus, approximately 5.2 wt% of hydrogen can be released during the second dehydrogenation process. |
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| Keywords: | Lithium borohydride Reactive hydride system Hydrogen storage properties Reaction mechanism |
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