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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Composites for Energy Applications: Materials for Renewable Energy Applications 2022
Presentation Title Energetics of the Reversible Dehydrogenation of Magnesium Borohydride and Mg(BH4)2-THF Composite to Magnesium Boranes
Author(s) CRAIG JENSEN, Sunil Shrestha, Kazuumi Fujioka, Rui Sun, Phuong Nguyen, Tom Autrey
On-Site Speaker (Planned) CRAIG JENSEN
Abstract Scope Magnesium borohydride has been extensively studied as a potentially viable, practical hydrogen storage material. The dehydrogenation of the composite material resulting from the addition of sub-stoichiometric amounts tetrahydrofuran exhibits much more rapid kinetics than those of pure Mg(BH4)2 and results in selective formation Mg(B10H10) rather than Mg(B3H8)2 (hydrogen cycling capacity 2.7 vs 8.1 wt %). In order to better understand the energetic parameters associated responsible for the divergent reactivities of pure and Mg(BH4)2(THF)0.25, we have obtained isothermal kinetic data for the reversible dehydrogenation of these materials in the 180-240 ˚C range and conducted kinetic modeling studies. Excellent fits with the experimental data have been obtained employing models that assume the dehydrogenation reaction is readily reversible. This talk will present the activation energies for the dehydrogenation and hydrogenation reactions that have been deduced from these studies as well as the enthalpies of dehydrogenation that are indicated by these results.
Proceedings Inclusion? Planned:
Keywords Energy Conversion and Storage, Computational Materials Science & Engineering, Composites


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