An Electrochemically Treated BiVO4 Photoanode for Efficient Photoelectrochemical Water Splitting

Abstract BiVO 4 films with (040) facet grown vertically on fluorine doped SnO 2 (FTO) glass substrates are prepared by a seed‐assisted hydrothermal method. A simple electrochemical treatment process drastically enhances the photocatalytic activity of BiVO 4 , exhibiting a remarkable photocurrent density of 2.5 mA cm −2 at 1.23 V vs. reversible hydrogen electrode (RHE) under AM 1.5 G illumination, which is approximately 10‐fold higher than that of the pristine photoanode. Loading cobalt borate (CoBi) as cocatalyst, the photocurrent density of the BiVO 4 photoanode can be further improved to 3.2 mA cm −2 , delivering an applied bias photon‐to‐current efficiency (ABPE) of 1.1 %. Systematic studies reveal that crystal facet orientation also synergistically boosts both charge separation and transfer efficiencies, resulting in remarkably enhanced photocurrent densities. These findings provide a facile and effective approach for the development of efficient photoelectrodes for photoelectrochemical water splitting.