In Situ Preparation of Mo:BiVO₄ Photoanodes Coupled with BiOBr Cathode for Efficient Photoelectrocatalytic CO₂ Reduction Performance

Photoanode‐driven photoelectrocatalytic (PEC) reduction of CO 2 is an ideal way for solving problems such as the greenhouse effect and environmental crisis. In this study, a one‐step hydrothermal method is successfully used for the preparation of BiVO 4 films doped with different mass fractions of Mo. In the results, it is shown that when Mo is doped at 1.5 wt%, photocurrent densities of up to 4.11 mA cm −2 are obtained, 3.36 times greater than those of undoped BiVO 4 , and there is a marked cathodic shifting of water oxidation reaction initiation potential. Subsequently, coupling it with the BiOBr nanosheet cathode, the generated CH 3 OH rate reaches 45.67 μmol L −1 h −1 cm −2 at a low applied voltage of 1.2 V RHE , with a Faraday efficiency of 60.68% for PEC CO 2 reduction. This work is important for Bi‐based thin‐film self‐assembly coupled with PEC CO 2 systems.