Strong interfacial bonded In <sub>4/3</sub>P <sub>2</sub>S <sub>6</sub>/TiO <sub>2</sub> S-scheme junction with multi-channel charge transport for boosting photocatalytic water reduction
Wen-Jing Yi, Shuai Wei, Xin Du, Shasha Yi, Zheng-Lan Tian, Zhongyi Liu, Xin‐Zheng Yue
Abstract
The rational design of a heterostructural photocatalysts with efficient charge separation and accelerated interfacial charge transfer holds great promise for boosting photocatalytic activity. Herein, we have developed a unique hierarchical In<sub>4/3</sub>P<sub>2</sub>S<sub>6</sub>/TiO<sub>2</sub> heterojunction with P-O interfacial bonding for photocatalytic water reduction. By integrating emerging In<sub>4/3</sub>P<sub>2</sub>S<sub>6</sub> nanosheets through intense interfacial coupling effect, the optimized In<sub>4/3</sub>P<sub>2</sub>S<sub>6</sub>/TiO<sub>2</sub> heterostructure exhibits a remarkably enhanced photocatalytic H<sub>2</sub> evolution activity compared to that of pristine TiO<sub>2</sub>. Combined experimental and theoretical results confirm that multiple interfacial bonded S-scheme charge transfer pathways are established in the In<sub>4/3</sub>P<sub>2</sub>S<sub>6</sub>/TiO<sub>2</sub> photocatalyst, which synergistically promote charge separation and transfer through the robust interfacial electric field and rapid charge migration pathways formed by interfacial bonds. This study emphasizes the significance of developing novel interfacial bonded In<sub>4/3</sub>P<sub>2</sub>S<sub>6</sub>-based S-scheme heterostructures, paving a new strategy towards enhancing photocatalytic activity for H<sub>2</sub> evolution.