Multicomponent-mediated ZnIn2S4-based photocatalysts for boosting hydrogen production coupled with benzyl alcohol oxidation performance

Multi-component optimization offers a potential route to achieve efficient bifunctional photocatalysis. However, rationally combining different components and clearly elucidating the photogenerated carrier dynamics still remain a significant challenge. In this study, ternary FeS 2 /S v -ZnIn 2 S 4 /FeOOH composites were constructed for efficient photocatalytic hydrogen production coupled with benzaldehyde generation. This material integrated sulfur vacancy, Ohmic-type FeS 2 /S v -ZnIn 2 S 4 contact and p-n-type S v -ZnIn 2 S 4 /FeOOH heterojunction, synergistically promoting the charge transfer and synchronous electron-hole utilization. As a result, high evolution rates of 21.5 and 21.2 mmol·g −1 ·h −1 for hydrogen production and benzaldehyde generation were achieved, accompanying with an apparent quantum efficiency of 14.2% at 420 nm, a fantastic benzaldehyde selectivity of 99.84%, and excellent photostability. This study provides a multi-component engineering strategy for regulating the charge carrier dynamics and enhancing the bifunctionally photocatalytic performance.