Integrated Carbon‐Based Nanostructures for Boosting Photocatalytic H ₂ O ₂ Evolution Over CdS@ZnIn ₂ S ₄ Heterojunctions

It remains a significant challenge to develop efficient photocatalytic systems toward specific chemical transformation schemes. Herein, this study involves the development of CdS@ZnIn 2 S 4 @carbon heterojunctions for photocatalytic evolution of hydrogen peroxide. The dual role of the carbon component as an electron mediator/acceptor is crucial for the enhanced evolution rate of peroxide, whereas the relative population of sp2‐hybridized domains is greatly correlated with the photocatalytic performance of the ternary hybrids. Compared with the binary counterpart CdS@ZnIn 2 S 4 , the optimized ternary hybrid (0.3 wt% carbon) demonstrated a fivefold increase in photocatalytic performance. Scavenging experiments confirm that the dominant mechanistic scheme for peroxide evolution is the concerted two‐electron oxygen reduction. Furthermore, establishment of the energy diagram reveals efficient spatial separation of charge carriers via a proposed Z‐scheme configuration. This work sheds insightful light on the development of functional photocatalytic systems for enhancing performance in specific chemical transformation schemes.