Construction and Photocatalytic Activity of Monoclinic Tungsten Oxide/Red Phosphorus Step-scheme Heterojunction

S-scheme heterojunction has been extensively investigated for hydrogen evolution and environmental pollution issues. In this study, a monoclinic WO 3 /hydrothermally treated red phosphorus (HRP) S-scheme composite was prepared by hydrothermal method. XPS and EPR characterization confirmed that the monoclinic WO 3 /HRP composite formed S-scheme heterojunction. 5%WO 3 /HRP composite displayed the optimal photocatalytic activity under visible light irradiation, and its degradation rate of Rhodamine B (RhB) reached 97.6% after 4 min of visible light irradiation, while its hydrogen evolution rate reached 870.69 molh -1 g -1 which was 3.62 times of that of pure HRP. This could be ascribed to the tight interfacial bonding between WO 3 and HRP, and the formation of S-scheme heterostructure, enabling rapid separation of photogenerated carriers and therefore improving the strong redox capacity. This study provided a promising RP-based photocatalyst to meet the demand for clean energy and drinking water.