Rapid hydrogen generation from aluminum–water system by adjusting water ratio to various aluminum/aluminum hydroxide

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:H2O weight ratio (3:15:50). That is, by adjusting Al:Al(OH)3:H2O ratio, the highest hydrogen generation rate ever reported so far, without using any alloying elements or corrosive additives, can be achieved.