Abstract
The poor properties of carrier separation and transfer on BiVO4 surface are two major bottlenecks for nanostructured BiVO4 photoanodes during solar water oxidation. Herein, BiVO4/resorcinol–formaldehyde resin (BiVO4/RFS) heterojunction films were prepared by coupling resorcinol–formaldehyde resin (RFS) nanoparticles on BiVO4 films’ surface, and investigated as photoanodes for solar water oxidation. The light harvesting and electrochemical properties of the resultant BiVO4/RFS film was close to the BiVO4 film, but its carrier radiative recombination was weakened significantly. Relative to the BiVO4 film photoanode, better water oxidation activity, kinetics and stability were observed on the BiVO4/RFS film photoanode. The conduction and valence band potential of RFS nanoparticles were discovered to be lower than those of BiVO4, and the surface photogenerated holes and electrons could be directionally transferred to RFS nanoparticles and BiVO4 film, respectively. The higher solar water oxidation performance on the BiVO4/RFS photoanode was mainly originated from the separation and transfer of surface carrier through the BiVO4/RFS coupling interfaces under AM 1.5G irradiation. The present work could provide inspiration in the design and development of similar heterojunction materials for solar water splitting.
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