Abstract
Macroporous silicon disks containing ordered channels of 2 μm side and 0.2 mm length (9 × 106 channels cm−2) have been functionalized with a thin layer of Au/TiO2 and Pt/TiO2 photocatalysts and tested in the photoproduction of hydrogen using UV light from water-ethanol mixtures in gas phase. An outstanding hydrogen production rate of 212 μmol h−1 cm−3reactor is demonstrated, which is three orders of magnitude higher than those achieved in conventional photoreactors. According to the simulation results, the fabulous hydrogen production rates obtained with the macroporous silicon photocatalytic structures are ascribed to an extraordinary high specific surface area per volume unit and to an enhanced light exploitation. This new microphotoreactor concept could boost the production of solar hydrogen for on-site and portable applications.
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