Al-N-Compounds – Possible Materials for Hydrogen Storage
Aluminum hydride (AlH3) by itself has already been considered as a hydrogen storage material over 50 years ago based on its high volumetric (148 g H2 L-1) and gravimetric (10.1 wt.-%) hydrogen density. Based on its low decomposition temperature and light weight, research on AlH3 confining the impractical re-hydrogenation conditions is still in progress. Attempts to stabilize AlH3 with a Lewis base, such as an amine, lead to a significant reduction of the thermodynamic hydrogenation barrier of Al. This approach enables the hydrogenation at room temperature and reasonable pressures to generate amine AlH3 adducts, called amino alanes. The influence of tertiary amines leads to stabilized phases under mild conditions offering promising properties for reversible hydrogenation.
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