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Surface modification of a TiO2 film electrode prepared by the sol-gel method and its effect on photoelectrochemical behavior |
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| Authors: | T Yoko K Kamiya A Yuasa K Tanaka and S Sakka |
| Institution: | 1 Department of Industrial Chemistry, Faculty of Engineering, Mie University, Tsu, Mie-ken 514, Japan 2 Institute for Chemical Research, Kyoto University, Gokasho, Uji 611, Japan |
| Abstract: | The surface of a TiO2 film electrode, about 1 μm thick, prepared by the sol-gel method, was modified by being additionally coated with about 0.1 μm thick TiO2---SiO2, TiO2---ZrO2 or TiO2---Al2O3 films. The effect of the additional coating on the photoelectrochemical properties of a TiO2 film electrode was investigated in detail. On addition of the second additive to TiO2, the flat band potential was shifted toward negative potential for SiO2 and positive potential for ZrO2 and Al2O3, which is attributed to the change in the point of zero zeta potential (pzzp), not in the electron affinity (EA). However, enhancement in photocurrent was not observed for all the cases. |
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