Reversible hydrogen storage in LiBH4/Ca(AlH4)2 systems |
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| Authors: | DM Liu C Gao ZX Qian TZ Si QA Zhang |
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| Affiliation: | 1. School of Materials Science and Engineering, Anhui University of Technology, Maanshan, Anhui 243002, PR China;2. State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027, PR China |
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| Abstract: | To improve the hydrogen storage property of LiBH4, the LiBH4/Ca(AlH4)2 reactive systems with various ratios were constructed, and their de-/hydrogenation properties as well as the reaction mechanisms were investigated experimentally. It was found that the sample with the LiBH4 to Ca(AlH4)2 molar ratio of 6:1 exhibits the best comprehensive hydrogen storage properties, desorbing hydrogen completely (8.2 wt.%) within 35 min at 450 °C and reversibly absorbing 4.5 wt.% of hydrogen at 450 °C under a hydrogen pressure as low as 4.0 MPa. During the first dehydrogenation process of the LiBH4/Ca(AlH4)2 systems, the CaH2 and Al particles were in situ precipitated via the self-decomposition of Ca(AlH4)2, and then reacted with LiBH4 to form CaB6, AlB2 and LiH. Whereafter, the sample can cycle between LiBH4 + Ca(BH4)2 + Al in the hydrogenated state and CaB6 + AlB2 + LiH in the dehydrogenated state. |
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| Keywords: | Hydrogen storage materials Lithium borohydride Calcium alanate Reactive hydride system Hydrogen storage properties |
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