1979. The atomic structure consisted of isolated [AlH4]− tetrahedra in which the Na atoms are surrounded by eight [AlH4]− tetrahedra in a distorted square. Hydrogen release from NaAlH4 is known since the 1950s. In 1997, Bogdanovic discovered that TiO2 doping of materials makes the process reversible at modest temperature and pressure. TiO2-doped materials are reversible in hydrogen storage, NaAlH4 is currently the state of the art reversible solid state hydrogen storage material which can be used in low temperature and has 5.6 wt.% hydrogen contained. The chemical reaction is, 3NaAlH4 ← catalyst → Na3AlH6 + 2Al + 3H2 ← catalyst → 3NaH + Al + 3/2H2. The heat required to change from NaAlH4 to Na3AlH6 is 37 kJ/mol. The heat required to change from Na3AlH6 to NaH is 47 kJ/mol. In principle, the first step of NaAlH4 releases 3.7 wt.% hydrogen at about 190 °C and the second step releases 1.8 wt.% hydrogen at about 225 °C upon heating. Further dehydrogenation of NaH occurs only at temperature higher than 400 °C. This temperature is too high for technical applications, therefore, can not be used in a fuel cell vehicle. Lithium alanate (LiAlH4) was synthesized for the first time in 1947 by dissolution of lithium hydride in an ether solution of aluminium chloride. LiAlH4 has a theoretical gravimetric capacity of 10.5 wt %H2 and dehydrogenates in the following three steps: 3LiAlH4 ↔ Li3AlH6 + 3H2 + 2Al (423–448 K; 5.3 wt %H2; ∆H = −10 kJ·mol−1 H2); Li3AlH6 ↔ 3LiH + Al + 1.5H2 (453–493 K; 2.6 wt %H2; ∆H = 25 kJ·mol−1 H2); 3LiH + 3Al ↔ 3LiAl + 3/2H2 (>673 K; 2.6 wt %H2; ∆H = 140 kJ·mol−1 H2). The first two steps lead to a total amount of hydrogen released equal to 7.9 wt %, which could be attractive for practical applications, but the working temperatures and the desorption kinetics are still far from the practical targets. Several strategies have been applied in the last few years to overcome these limits, such as ball-milling and catalysts additions. Potassium Alanate (KAlH4) was first prepared by Ashby et al. by one-step synthesis in toluene, tetrahydrofuran, and diglyme. Concerning the hydrogen absorption and desorption properties, this alanate was only scarcely studied. Morioka et al., by temperature programmed desorption (TPD) analyses, proposed the following dehydrogenation mechanism: 3KAlH4 →K3AlH6 + 2Al + 3H2 (573 K, ∆H = 55 kJ·mol−1 H2; 2.9 wt %H2),