In-situ constructing ZnIn2S4@In(OH)3@CdS heterostructure for efficient photocatalytic H2 generation under visible light irradiation

In the face of energy scarcity and environmental degradation, photocatalysis emerges as a green and highly efficient method to convert solar energy into a renewable energy source. In this study, CdS nanoparticles were successfully grown in situ along the edges of ZnIn2S4 nanosheets using ultrasound during the synthesis process and the second phase precipitation of In(OH)3 appeared in the process of preparation. Optimal Cd and S ratios resulted in ZnIn2S4@In(OH)3@CdS heterojunction exhibiting remarkable photocatalytic H2 production performance compared to standalone ZnIn2S4 and CdS. The internal heterojunction interface within the composite naturally generates an electric field, enhancing carrier separation and facilitating their transport. Additionally, the inclusion of In(OH)3 further expedites carrier extraction. Ultimately, the mechanism behind the photocatalytic H2 production was elucidated using the Z-scheme mechanism. This work introduced a novel approach to fabricating multifunctional photocatalysts, presenting a fresh perspective in their design and preparation.