Hydrogen storage properties of LiBH4 destabilized by SrH2

Abstract: In this work, we have succeeded in destabilizing LiBH4 by the addition of SrH2, via the reaction 6LiBH4 +SrH2 →SrB6 +6LiH+10H2 with a theoretical hydrogen capacity of 9.1wt.%. According to the van’t Hoff and Arrhenius equations, the dehydrogenation enthalpy change and activation energy for the LiBH4/SrH2 system were experimentally determined to be 48kJ/mol H2 and 64kJ/mol, respectively. Both are remarkably reduced in comparison with the pristine LiBH4, which is responsible for the improved dehydrogenation property of the LiBH4/SrH2 system. The dehydrogenated products SrB6 +6LiH can be rehydrogenated to form LiBH4 and LiSrH3 at 723K under an initial hydrogen pressure of 8.0MPa. [Copyright &y& Elsevier]