Abstract
A photo-electrochemical reactor for water splitting with a Si(IV)-doped Fe2O3 photoanode was designed to investigate the effects on photocurrent densities of electrode potential, photon flux and 'front' and 'back' illumination of the photoanode. As a design tool to optimize the reactor performance, a 1-D kinetic model incorporating photogeneration, diffusion, migration, recombination and surface reaction terms, was developed to predict minority carrier concentration profiles and hence photocurrent densities. Model predictions were in good agreement with experimental photocurrent densities, which increased linearly with increased light intensity. Photocurrent densities decreased by 90 % when the direction of illumination was switched from hν -> electrolyte | semiconductor to hν -> glass | fluorinated tin oxide | semiconductor | electrolyte, due to the resulting decrease in hole concentrations at the semiconductor | liquid junction.
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