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

• Published in: Applied catalysis. B, Environmental Vol. 259; p. 118073
• Main Authors: Zhang, Lulu, Zhang, Hongwen, Jiang, Cankun, Yuan, Jie, Huang, Xueyan, Liu, Ping, Feng, Wenhui
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.12.2019; Elsevier BV
• Subjects: Charge transfer; Charge transfer mode switcher; Cocatalyst; Electron-hole mediator; Electrons; Evolution; Holes (electron deficiencies); Molybdenum disulfide; Nanoparticles; Organic chemistry; Photocatalysis; Tungsten oxides; Z-scheme; Z-scheme; Cocatalyst; Electron-hole mediator; Charge transfer mode switcher
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2019.118073

[Display omitted] •As a charge transfer mode switcher, MoS2 can transform the conventional type-II charge transfer mode to Z-scheme.•As electron-hole mediator, MoS2 can quench the energy of the electrons from WO3 and the holes from CdS in shorten length.•As a cocatalyst, the CB of MoS2 can provide active sites for photocatalytic evolution H2 driven by the electrons from CdS.•WO3@MoS2/CdS shows improved performance compared with WO3/CdS or MoS2/CdS owing to the multifunctional roles of MoS2. 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 Z-scheme 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 H2 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.