Abstract
Analytical expressions are derived to theoretically analyse the effect of different operational parameters on the electron concentration at the back contact and the quantum efficiency of the nanostructured TiO2 photocatalytic electrodes in contact with aqueous electrolytes. The influence of film thickness, light absorption coefficient and electron diffusion coefficient is considered cumulatively to find the optimal fabrication conditions. Light intensity, concentration of the dissolved pollutant and the recombination rate constants are also analysed as the main affective parameters during the operation of the photocatalytic device. Finally, the competitive behaviour of generation and recombination rates of photogenerated charge carriers is considered along with the quantum efficiency. The results indicate that for any given condition, there is always an optimal film thickness at which the system has the highest quantum yield. It is also found out that the light intensity is the most important operational factor, for which the optimal amount should also be determined for any specific films and operational conditions.
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