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• W2001495213 abstract "The basic principles of semiconductor photoelectrochemistry as applied to light to chemical and/or electrical energy conversions are outlined. Special emphasis is on the photoelectrolysis of H2O to H2 and O2. New results are presented which show that platinized n-type SrTiO3 and KTaO3 evolve H2 and O2 from alkaline aqueous solutions when irradiated with ultraviolet light. The irradiated portions of the metal oxide behave as the photoanode and the dark platinized portions behave as the cathode. The nonplatinized oxides are energetically capable of evolving H2 and O2 upon irradiation but the overvoltage for H2 is too great. The general requirement for the “short-circuit” redox chemistry at the irradiated n-type semiconductor surface is that the dark cathodic reaction occur at a potential more positive than the anodic reaction upon irradiation. The role of the Pt coating is to reduce the H2 overvoltage to meet this requirement. It is demonstrated that polished n-type TiO2 and SrTiO3 are both capable of oxidizing H2O to evolve O2 and reducing Cu2+ to plate out Cu upon irradiation in 0.5 M CuSO4 (pH = 7). We discuss the importance of “short-circuit” redox chemistry and overvoltage in obtaining opencircuit photopotential in photoelectrochemical cells." @default.
• W2001495213 created "2016-06-24" @default.
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• W2001495213 date "1977-09-01" @default.
• W2001495213 modified "2023-09-23" @default.
• W2001495213 title "Photoelectrolysis of water by irradiation of platinized n-type semiconducting metal oxides" @default.
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• W2001495213 doi "https://doi.org/10.1016/0022-4596(77)90185-2" @default.
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