Z-scheme system of WO3@MoS2/CdS for photocatalytic evolution H2: MoS2 as the charge transfer mode switcher, electron-hole mediator and cocatalyst

A novel ternary Z-scheme system of WO3@MoS2/CdS is successfully constructed using a three-step wet-chemical route, where MoS2 locates between the rod-shaped WO3 and CdS nanoparticles and simultaneously plays multiple roles of the charge transfer mode switcher, electron-hole mediator and cocatalyst. As a charge transfer mode switcher, MoS2 can transform the conventional type-II charge transfer mode to Z-scheme. In such a Zscheme system, as an electron-hole mediator, MoS2 is applied to quench the energy of the electrons from WO3 and the holes from CdS in shorten length, and thus the more left electrons from CdS can transfer to MoS2, which can be further applied to photocatalytic evolution H-2 owing to the cocatalyst role of MoS2. Benefitting from the multifunctional roles of MoS2, such a Z-scheme system of WO3@MoS2/CdS shows an enhanced photocatalytic performance.