Abstract
TiO2 porous thin film has been widely used as the photoanode of the photocatalytic fuel cell. The distribution of the light intensity in this type of the photoanode greatly affects its performance, which can be obtained by solving the radiative transfer equation. Under this circumstance, the determination of the radiative properties of the TiO2 porous thin films is crucial. In this work, based on the measured thickness, the normal-hemispherical reflectance and transmittance of the porous thin films, the absorption coefficient and scattering coefficient were determined by using the spectral element method. It was found that the TiO2 porous thin films exhibited high scattering coefficient and relatively low absorption coefficient. The absorption coefficient sharply decreased in the UV region with increasing the wavelength and then was almost unchanged in the visible-light range. The scattering coefficient firstly increased and then decreased. There existed a maximum scattering coefficient at a wavelength of about 378 nm. Moreover, the effect of the porosity was investigated by adding the pore former of PMMA in the porous thin film. The results indicated that the scattering coefficient remarkably increased with increasing the porosity, while the absorption coefficient was insensitive to the porosity variation.
Published Version
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