0D Pt anchoring on 2D/2D H2WO4/TiO2 S-scheme heterojunction for enhanced photocatalytic H2 evolution and simultaneous wastewater purification.

Constructing heterojunction between two semiconductors is an effective way to design high performance photocatalysts. S-scheme heterojunction system with strong redox ability is fit for the photocatalytic H 2 evolution and simultaneous wastewater purification. Herein, a 2D/2D heterojunction (H 2 WO 4 /TiO 2) has been constructed between tungstic acids (H 2 WO 4) and titanium dioxide (TiO 2) nanosheets. Due to the photo-electron storage ability of H 2 WO 4 , a S-scheme heterojunction system is constructed. Meanwhile, 0D Pt nano cluster are loaded on the surface of TiO 2 , which logic underpins the formation of the S-scheme heterojunction electron pathway. Benefit from the facilitated charge transport for the direct charge path and the preserved redox ability, 0D Pt–H 2 WO 4 /TiO 2 hybrid exhibits high H 2 production activity (3440 μmol h−1 g−1) with RhB as sacrificial agent. This work provides a novel strategy to design 2D/2D S-scheme heterojunction to improve photocatalytic performance in dual functional photocatalytic H 2 production system with organic dyes as sacrificial agent. [Display omitted] • Synthesis of a 2D/2D H 2 WO 4 /TiO 2 S-scheme heterojunction is reported. • Electrons storage and strong redox ability of H 2 WO 4 /TiO 2 is reported. • High H 2 evolution reaction performance with RhB as sacrificial agent. [ABSTRACT FROM AUTHOR]