Nowadays, energetic needs are mainly covered by fossil fuels with concomitant pollutant emissions responsible for global warming. Among the possible solutions to reduce the greenhouse effect, hydrogen has been proposed for energy transportation. Indeed, this gas can be seen as a clean and efficient energy carrier. However, besides the difficulties related to hydrogen production, high-capacity storage is still to be developed. Hydrogen can be stored as a compressed gas, liquefied in tanks, and ab-or adsorbed in solids. [1][2][3] Many compounds are able to store large amounts of hydrogen. Such solid-state solutions are of interest in terms of safety, global yield, and long-term storage. However, to be suitable for applications, such compounds must have high capacity, good reversibility, fast reactivity, and sustainability. Two different approaches are possible for solid-state storage of hydrogen. In the first, the hydrogen molecule is dissociated and H atoms form chemical bonds with the solid (chemisorption). Such a process allows a very high volumetric density at temperatures and pressures close to ambient conditions. However, storage in metal hydrides has the drawback of low weight capacities, essentially due to the high molar mass of heavy metals such as
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