Dye-Sensitized Photocatalyst System for Water Splitting Into H₂ and O₂ Under Visible Light Irradiation Available to Purchase

H₂ production from a water-acetonitrile mixed solution containing iodide electron donor was investigated over dye-sensitized Pt/TiO₂ photocatalysts under visible light irradiation, as a part of water splitting system using iodide redox mediator. The rates of H₂ evolution were decreased with the increase of the water ratio in the mixed solutions, because of the decrease in energy gap between the redox potential of I₃⁻/I⁻ and the HOMO levels of the dyes, which lowing the efficiency of electron transfer from I⁻ to dye.