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Reversible storage of hydrogen in destabilized LiBH4
Magnesium hydride (MgH2) destabilizes lithium borohydride (LiBH4) for improved reversible hydrogen storage. This additive lowers the energy required for hydrogen release, achieving 8-10 wt % storage capacity.
Area of Science:
- Materials Science
- Chemical Engineering
- Hydrogen Storage
Background:
- Lithium borohydride (LiBH4) is a promising material for reversible hydrogen storage but suffers from high operating temperatures.
- Destabilizing LiBH4 is crucial for practical hydrogen storage applications.
Discussion:
- Addition of magnesium hydride (MgH2) to LiBH4 significantly lowers the hydrogenation/dehydrogenation enthalpy by approximately 25 kJ/(mol of H2).
- The formation of magnesium boride (MgB2) during dehydrogenation stabilizes the products, effectively destabilizing LiBH4.
- Mechanically milled mixtures of LiBH4 + (1/2)MgH2 or LiH + (1/2)MgB2 with TiCl3 catalyst achieved 8-10 wt % reversible hydrogen storage.
Key Insights:
- MgH2 acts as an effective destabilizing additive for LiBH4.
- The destabilization lowers the thermodynamic barrier for hydrogen release.
- A reversible hydrogen storage capacity of 8-10 wt % was demonstrated.
Outlook:
- Extrapolation of isotherm data predicts an equilibrium pressure of 1 bar at around 225°C.
- Further research is needed to improve the kinetics for practical application at lower temperatures.
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