International Journal of Hydrogen Energy, Vol.45, No.18, 10729-10734, 2020
Enhanced rate of hydrogen production by corrosion of commercial aluminum
Hydrogen has been produced by corrosion of technical grade aluminum Al-6061. Al-6061 is an alloy containing a small percentage of several elements, mainly Mg and Si. It has been verified that this alloy is corroded faster and produces more hydrogen per unit of time than pure aluminum. This result is due to facilitation of corrosion at grain boundaries in aluminum alloys. Hydrogen production rates have been dramatically accelerated by decreasing the size of aluminum particles. Thus Al-6061 turnings have been produced with a lathe and then they were compressed to create porous pellets with a density of 72% compared to solid pure aluminum. These pellets can produce hydrogen in concentrated KOH solutions at very high rates reaching 66.7 ml min(-1). This method is safe and reproducible and it may find important application as a means to "store " hydrogen in the form of porous Al-6061 pellets. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.