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Aluminum hydride (AlH 3 ) is a promising candidate for hydrogen storage due to its high hydrogen density of 10 wt%. Several polymorphs of AlH 3  (e.g., α, β, and γ) have been successfully synthesized by wet chemical reaction of LiAlH 4  and AlCl 3  in ether solution followed by desolvation. However, the synthesis process of α'-AlH 3  from wet chemicals still remains unclear. In the present work, α'-AlH 3  was synthesized first by the formation of the etherate AlH 3  through a reaction of LiAlH 4  and AlCl 3  in ether solution. Then, the etherate AlH 3  was heated at 60°C under an ether gas atmosphere and in the presence of excess LiAlH 4  to remove the ether ligand. Finally, α'-AlH 3  was obtained by ether washing to remove the excess LiAlH 4 . It is suggested that the desolvation of the etherate AlH 3  under an ether gas atmosphere is essential for the formation of α'-AlH 3  from the etherate AlH 3 . The as-synthesized α'-AlH 3  takes the form of rod-like particles and can release 7.7 wt% hydrogen in the temperature range 120–200°C.

Wet Chemical Synthesis of Non-solvated Rod-Like α'-AlH3 as a Hydrogen Storage Material