Progress in Hydrogen Storage in Complex Hydrides

Complex hydrides are potential candidates for solid state hydrogen storage due to their high gravimetric hydrogen capacities. The present chapter focuses on the most recent progress in the understanding of the hydrogen storage behavior of light metal-based complex hydrides and their (nano)composites. Hydrides such as sodium (NaAlH 4 ) and lithium (LiAlH 4 ) alanate containing various catalyzing additives, complex hydride (nano)composite systems containing LiAlH 4 , lithium amide (LiNH 2 ) and magnesium hydride (MgH 2 ) as well as manganese borohydride (Mn(BH 4 ) 2 ), which was synthesized by the mechanochemical activation synthesis (MCAS) are all discussed. In particular, the phenomena of mechanical dehydrogenation and slow hydrogen discharge during a long-term storage after processing by ball milling are thoroughly discussed. Furthermore, isothermal dehydrogenation behavior of the above mentioned complex hydride systems is thoroughly discussed.