MICROSCOPIC OBSERVATION OF PHOTOCATALYTIC REACTION USING MICROELECTRODE - SPATIAL-RESOLUTION FOR REACTION-PRODUCTS DISTRIBUTION

We employed a Pd-loaded TiO2 film as a simple model for the metal-deposited photocatalyst and carried out spatial mapping of reaction products formed by the photocatalytic reactions in a Fe(CN)(6)(3-/4-) aqueous solution using a microelectrode. The experimental data were simulated with a diffusion model solved by the finite difference method. The results indicate that the spatial resolution of ca. 70 mu m call be obtained with a distance of 30 mu m between the sample surface and the microelectrode.