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Interface equilibriaInterface equilibria G 6000Reversible Hydrogen Decomposition of KAlH 4 . -As revealed by temperature-programmed desorption measurements, the title compound exhibits a rapid reversible hydrogen decomposition reaction without any aid of external catalysts. Reversible hydrogenation/dehydrogenation is clearly observed over the temperature range 250-340°C under < 10 bar H2. The hydrogen storage ability is above 3.5 wt% (81.4% of the theoretical value). KAlH 4 may successfully compete with a lightweight but high-temperature metal hydride system such as Mg2NiH4. -(MORIOKA*, H.; KAKIZAKI, K.; CHUNG, S.-C.; YAMADA, A.; J.