Z-Scheme Modulated Charge Transfer on InVO 4 @ZnIn 2 S 4 for Durable Overall Water Splitting.

The charge transfer within heterojunction is crucial for the efficiency and stability of photocatalyst for overall water splitting (OWS). Herein, InVO 4 nanosheets have been employed as a support for the lateral epitaxial growth of ZnIn 2 S 4 nanosheets to produce hierarchical InVO 4 @ZnIn 2 S 4 (InVZ) heterojunctions. The distinct branching heterostructure facilitates active site exposure and mass transfer, further boosting the participation of ZnIn 2 S 4 and InVO 4 for proton reduction and water oxidation, respectively. The unique Z-scheme modulated charge transfer, visualized by simulation and in situ analysis, has been proved to promote the spatial separation of photoexcited charges and strengthen the anti-photocorrosion capability of InVZ. The optimized InVZ heterojunction presents improved OWS (153.3 µmol h -1  g -1 for H 2 and 76.9 µmol h -1  g -1 for O 2 ) and competitive H 2 production (21090 µmol h -1  g -1 ). Even after 20 times (100 h) of cycle experiment, it still holds more than 88% OWS activity and a complete structure.