Photocurrents and degradation rates on particulate TiO2 layers: Effect of layer thickness, concentration of oxidizable substance and illumination direction |
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| Authors: | Georg Waldner,Josef Krý sa |
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| Affiliation: | a Vienna University of Technology, Institute of Materials Chemistry, Veterinärplatz 1/GA, A-1210 Vienna, Austria
b Institute of Chemical Technology, Department of Inorganic Technology, Technická 5, 166 28 Prague 6, Czech Republic |
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| Abstract: | Different routes for immobilization of TiO2 on conducting substrates were compared to find active and stable photocatalysts, which could either be operated in open circuit (photocatalysis) or with applied electric potential (photoelectrocatalysis). The advantage of applying an electric potential was investigated. Polarization curves and photoelectrochemical degradation reactions served to characterize catalysts and to find a way of predicting the optimum synthesis conditions. The difference between front side (EE) and back side (SE) illumination is discussed as a function of layer thickness, as well as the influence of oxidizable substance concentration on photocurrents. Stability of catalysts was investigated in repetitive degradation experiments. |
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| Keywords: | Photoelectrocatalysis IPCE Quantum yield Oxalic acid 4CP |
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