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The effect of Al(OH) 3 on the hydrogen generation from Al/water system is evaluated. Four synthesized and one commercial Al(OH) 3 powders are employed to investigate their assistance to the hydrogen generation from Al/water system at room temperature. It was found that the Al(OH) 3 product derived from Al(NO) 3 precursor exhibits the best catalytic effect and exerts the highest hydrogen generation rate. 100 % yield of hydrogen (1,360 ml/g Al at 25°C) can be achieved within 6 min at a proper Al:Al(OH) 3 :H 2 O weight ratio (3:15:50). That is, by adjusting Al:Al(OH) 3 :H 2 O ratio, the highest hydrogen generation rate ever reported so far, without using any alloying elements or corrosive additives, can be achieved. Keywords Water Á Aluminum hydroxide Á Hydrogen generation 5th International Congress on Energy and Environmental Engineering and Management (CIIEM).