Abstract
We demonstrate that the photoelectrochemical oxidation of water over undoped and Ti-doped α-Fe2O3 electrodes could be highly enhanced by in situ electrochemical reduction pretreatment at −1.2 ≤ E < −0.6 V versus a saturated calomel electrode in the dark in aqueous 1 M NaOH electrolyte for tens of minutes. This enhancement is mainly due to a significant decrease of charge recombination and a favourable photohole transfer and is physically associated with the partial transformation of Fe2O3 to Fe3O4/FeOOH and Fe by electrochemical reduction.
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