Metastable Metal Hydrides for Hydrogen Storage

Table 3

Decomposition reactions of a few metastable metal hydrides showing H₂ content (wt.%) and enthalpy (kJ/mol H₂). Negative enthalpy values indicate an exothermic decomposition reaction.

Reactant	Product	H2 content (wt.%)	ΔH  (kJ/mol H2)	References
LiAlH4	1/3Li3AlH6 + 2/3Al + H2	5.3	(−9.1 –) (−9.6)	[41, 42]
Li3AlH6	3LiH + Al + 3/2H2	5.6	27–29	[33, 41]
MgAlH42	MgH2 + 2Al + 3H2	7.0	1.8	[37, 43]
CaAlH42	CaAlH5 + A + 3/2H2	2.9	−7.4	[37]
LiMgAlH43	LiMgAlH6 + 2Al + 3H2	4.8	−15	[37]
α-AlH3	Al + 3/2H2	10	6.0–7.6	[20, 44, 45]
β-AlH3	Al + 3/2H2	10	5.3	[20]
γ-AlH3	Al + 3/2H2	10	4.7	[20]