the hydrogen generation rate is directly
proportional to the oxidation rate of Al. So, Al or Al alloys in
the form of powders have mainly been used to achieve a good
hydrogen generation rate, which is the result of the large reaction
area of the powders [1e9]. Although Al powders exhibit
high mass activity for the hydrolysis reaction, they are not
suitable for practical use due to their explosiveness when
exposed to moisture or a small amount of heat. In addition, to
store them safely, Al powders require additional complex
equipment. In attempts to use Al as an on-board hydrogen
generation material, the development of safe Al in bulk form
with a rapid hydrogen generation rate has proven to be a
the hydrogen generation rate is directlyproportional to the oxidation rate of Al. So, Al or Al alloys inthe form of powders have mainly been used to achieve a goodhydrogen generation rate, which is the result of the large reactionarea of the powders [1e9]. Although Al powders exhibithigh mass activity for the hydrolysis reaction, they are notsuitable for practical use due to their explosiveness whenexposed to moisture or a small amount of heat. In addition, tostore them safely, Al powders require additional complexequipment. In attempts to use Al as an on-board hydrogengeneration material, the development of safe Al in bulk formwith a rapid hydrogen generation rate has proven to be a
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