Hongmei Zhao,Tingting Zhang,Dongyu Shan,Ying Zhu,Ge Gao,Ye Liu,Jing Liu,Meiying Liu,Wansheng You
An intervening barrier for photocatalytic water decomposition and pollutant degradation is the frustratingly quick recombination of e − - h + pairs. Delicate design of heterojunction photocatalysts by coupling the semiconductors at nanoscale with well-matched geometrical and electronic alignments is an effective strategy to ameliorate the charge separation. Here a facile and environment-friendly l -cysteine-assisted hydrothermal process under weakly alkaline conditions is demonstrated for the first time to fabricate ZnIn 2 S 4 /In(OH) 3 hollow microspheres with intimate contact, which are verified by XRD, SEM, (HR)TEM, XPS , N 2 adsorption-desorption, UV–Vis DRS and photoluminescence spectra. ZnIn 2 S 4 /In(OH) 3 heterostructure (L-cys/Zn 2+ = 4, molar ratio) with a band-gap of 2.50 eV, demonstrates the best photocatalytic performance for water reduction and MB degradation under visible light, outperforming its counterparts (In(OH) 3 and ZnIn 2 S 4 ). The excellent activity of ZnIn 2 S 4 /In(OH) 3 heterostructure arises from the intercrossed band-edge positions as well as the unique hollow structure with large surface area and wide pore-size distribution, which are beneficial for the efficient charge migration from bulk to surface as well as at the interface between ZnIn 2 S 4 and In(OH) 3 . This work provides an efficient and eco-friendly strategy for one-pot synthesis of heterostructured composites with intimate contact for photocatalytic application.
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 ZnIn 2 S 4 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 ZnIn 2 S 4 @In(OH) 3 @CdS heterojunction exhibiting remarkable photocatalytic H 2 production performance compared to standalone ZnIn 2 S 4 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 H 2 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.
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