Interfacial engineering in heterostructure photocatalysts is crucial for efficient charge migration, yet achieving rational and controllable interface design remains a major challenge. In this work, SnIn 4 S 8 nanosheets were in situ grown on the octahedral surface of MIL-101(Cr) to leverage the Lewis acid-base properties of Cr and S, thereby enabling the controlled construction of an ion-coordinated interface. The resulting MIL-101(Cr)@SnIn 4 S 8 heterojunction enabled efficient capture and conversion of CO 2 and H 2 O. Furthermore, the Lewis acid-base coordination induces interfacial electron density redistribution, generating a built-in electric field that drives the formation of an S-scheme heterojunction between MIL-101(Cr) and SnIn 4 S 8 , while simultaneously preserving high‑energy photogenerated electron-hole pairs. Consequently, MIL-101(Cr)@SnIn 4 S 8 exhibited superior CO 2 photoreduction performance with H 2 O in the gas-solid phase, delivering a CO evolution rate of 26.9 μmol·g −1 ·h −1 . This work provides a viable strategy for interfacial engineering and demonstrates the application potential of S-scheme heterojunctions in photocatalytic reactions.
Jie Wang,Min Liu,Mei Wang,Yi Wang,Aiting Zhang,Xiang Zhao,Guisheng Zeng,Fang Deng
The effect of synthesis temperature and reaction time on the visible-light photocatalytic activity of hierarchical network-like SnIn 4 S 8 microspheres was investigated by the low-temperature co-precipitation strategy. The preparation temperature and reaction time have great influence on the photocatalytic activity of SnIn 4 S 8 , and the optimal preparation temperature and reaction time are 70 °C and 3 h, respectively. The SnIn 4 S 8 shows good reusability and high stability with no observable decrease of photocatalytic activity in five consecutive cycles.
Renzhi Xiong,Xiao Xiao,Yanjie Song,Keqin Chen,Yanhe Xiao,Baochang Cheng,Shuijin Lei
Photocatalytic technology offers a promising “one-stone-two-birds” solution to simultaneously combat energy scarcity and environmental contamination through hydrogen production and pollutant degradation. However, conventional photocatalysts suffer from severe limitations in bifunctional efficiency due to rapid charge recombination, poor visible-light harvesting, and inadequate redox power. Herein, a novel 1D/2D core-shell Sb 2 S 3 @SnIn 4 S 8 S-scheme heterojunction photocatalyst is engineered. The unique architecture, featuring Sb 2 S 3 nanorods wrapped by SnIn 4 S 8 nanosheets, achieves (i) maximized interfacial contact and charge transfer pathways, (ii) exposed active sites through high specific surface area, and (iii) directional spatial separation of photogenerated carriers. Crucially, the S-scheme heterojunction drives efficient charge separation while preserving strong redox capability. The Sb 2 S 3 @SnIn 4 S 8 catalyst realizes breakthrough dual-functionality: an outstanding average H 2 evolution rate of 3566.1 μmol g −1 h −1 and an impressive 90.5% degradation efficiency of tetracycline hydrochloride under 2 h of visible-light illumination. This performance surpasses the individual components by 7.6-fold (vs. Sb 2 S 3 ) and 4.8-fold (vs. SnIn 4 S 8 ) in H 2 production, highlighting the synergy. Moreover, the catalyst demonstrates broad applicability across diverse pollutant systems. This study provides a scalable platform for developing dual-functional photocatalysts toward sustainable energy-water nexus solutions.
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