DYE-SENSITIZED PHOTOCATALYST SYSTEM FOR WATER SPLITTING INTO H_2 AND O_2 UNDER VISIBLE LIGHT IRRADIATION

摘要

H_2 production from a water-acetonitrile mixed solution containing iodide electron donor was investigated over dye-sensitized Pt/TiO_2photocatalysts under visible light irradiation, as a part of water splitting system using iodide redox mediator. The rates of H_2 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 I_3~-/I~- and the HOMO levels of the dyes, which lowing the efficiency of electron transfer from I~- to dye.