Details

Autor(en) / Beteiligte

• Liu, D.M.
• Huang, W.J.
• Si, T.Z.
• Zhang, Q.A.

Titel

Hydrogen storage properties of LiBH4 destabilized by SrH2

Ist Teil von

• Journal of alloys and compounds, 2013-02, Vol.551, p.8-11

Ort / Verlag

Kidlington: Elsevier B.V

Erscheinungsjahr

2013

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• ► Thermal stability of LiBH4 can be remarkably reduced by the addition of SrH2. ► Dehydrogenation enthalpy change for the LiBH4/SrH2 system is 48kJ/mol H2. ► Dehydrogenation process of the LiBH4/SrH2 system is rate-limited by a three-dimension phase boundary mechanism. ► LiBH4 can be regenerated upon rehydrogenation at 723K under an initial hydrogen pressure of 8.0MPa. 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.