Steady‐state photooxidation currents at polycrystalline electrodes with low band bending were found to depend significantly on the reducing agents present in the electrolyte. Photooxidation of water at low band bending exhibited only transient character. Diffusion‐controlled photocurrents for the photooxidation of I − and in acidic solutions, and OH − in unbuffered neutral solution were observed at an RDE and could be fitted to the Levich equation. The steady‐state and the transient photocurrents are analyzed and discussed in terms of cathodic back‐reaction of intermediate products with conduction band surface forbidden electrons.
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Anderman et al. (1984) studied this question.