Abstract
The metal hydrolysis reaction is a convenient and user-friendly strategy for obtaining high-purity hydrogen on-demand. However, removal of the oxide and rapid corrosion of the metal are critical for hydrogen utilization in fuel cell. In this work, commercial Al-Si alloy, which is widely used in metal casting, are used as a raw material to generate high-purity hydrogen. Our results indicate that hydrogen evolution and Al corrosion are influenced by NaOH concentration, elevated temperature from exothermic reaction of Al or Si with OH–, decreased particle size of Al and the Al/Si micro-galvanic cell. And the maximum hydrogen generation rate is 116.4 mL (0.4 g)−1 min−1 for Al-10Si. This reaction consumes OH– ions from NaOH following addition of the first two batches, and then OH– ions derived from Al(OH)−4 or Al(OH)3.The hydrogen generated is transferred to a fuel cell; a stable current of ca. 1 A and voltage of about 0.25 V are obtained for Al-10Si during continuous hydrogen input. The by-product of pure Al(OH)3 and Si can be recovered separately. This investigation of Al-Si alloys as hydrogen generation materials may provide guidance for the exploration of other Si-based materials.
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