| Summary: | LiAlH<sub>4</sub> is a potential solid-state H<sub>2</sub> storage material, where safe and efficient H<sub>2</sub> storage is of critical importance for the transition towards a sustainable emission-free economy. To improve the H<sub>2</sub> release and storage properties of LiAlH<sub>4</sub>, confinement in porous media decreases the temperature of H<sub>2</sub> release and improves the kinetics, where considerably improved H<sub>2</sub> release properties are accompanied by a loss in the total amount of H<sub>2</sub> released. The capability of mesoporous carbon black to improve the H<sub>2</sub> storage properties of confined LiAlH<sub>4</sub> is investigated with temperature-programmed desorption and time-stability measurements using X-ray diffraction and N<sub>2</sub> gas adsorption measurements to characterize the composite materials’ composition and structure. Here, we present the capability of commercial carbon black to effectively lower the onset temperature of H<sub>2</sub> release to that of near-ambient, ≥295 K. In addition, the confinement in mesoporous carbon black destabilized LiAlH<sub>4</sub> to a degree that during ≤14 days in storage, under Ar atmosphere and at ambient temperature, 40% of the theoretically contained H<sub>2</sub> was lost due to decomposition. Thus, we present the possibility of destabilizing LiAlH<sub>4</sub> to a very high degree and, thus, avoiding the melting step before H<sub>2</sub> release at around 440 K using scaffold materials with fine-tuned porosities.
|
|---|