MIL-53(FeNiCo) decorated BiVO4 photoanode for efficient photoelectrochemical water oxidation

BiVO4 is considered as one of the important candidate materials for photoelectrochemical water splitting technology. However, the low efficiency of charge separation and poor kinetics of water oxidation limit its performance in the PEC water splitting. In this work, BiVO4/MIL-53(FeNiCo) photoanode was constructed by a facile hydrothermal deposition method, exhibiting excellent water oxidation ability under AM 1.5 G light irradiation, and achieving a photocurrent density of 3.53 mA cm-2 at 1.23 VRHE, which is about 3.2 times that of pure BiVO4. The electrochemical test results demonstrate that the decoration of MIL-53(FeNiCo) could enhance the charge transfer and accelerate the kinetics of water oxidation reaction, thus leading to the excellent PEC water splitting performance. The PEC stability is also significantly improved, indicating that MIL-53(FeNiCo) allows BiVO4 to be used for water oxidation for stable PEC water oxidation.