Direct Z-scheme photocatalytic overall water splitting on two dimensional MoSe2/SnS2 heterojunction. (24th January 2020)

• Record Type: Journal Article
• Authors: Wang, Biao; Wang, Xiaotian; Yuan, Hongkuan; Zhou, Tingwei; Chang, Junli; Chen, Hong
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 4(2020)
• Page Start: 2785
• Page End: 2793
• Publication Date: 2020-01-24
• Subjects: Heterostructure -- Photocatalytic water splitting -- Direct z-scheme -- Hybrid functional study; 00–01 -- 99-00; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2019.11.178
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The direct Z-scheme photocatalysts for overall water decomposition have aroused much concern on account of their strong redox ability and efficient separation of photogenerated electron-hole pairs. In the present work, we have constructed the two dimensional (2D) van der Waals (vdW) MoSe2 /SnS2 heterojunction and investigated its electronical and optical properties by applying hybrid functional calculations. The calculated band structures have implied that the MoSe2 /SnS2 heterostructure as a direct Z-scheme photocatalyst can make the best of visible light. The induced built-in electric field can effectively improve the separation efficiency of the photoinduced carriers. Moreover, compared with the MoSe2 and SnS2 monolayers, the absorption intensity of MoSe2 /SnS2 heterojunction is reinforced in the visible light range. Therefore, MoSe2 /SnS2 nanocomposite shows a bright application prospect as a direct Z-scheme visible-light-driven photocatalyst for overall water splitting. Graphical abstract: (a) Charge density difffferences for the MoSe2/SnS2 heterojunction. (b) Optical absorption spectra of MoSe2/SnS2 heterostructure. Image 1 Highlights: MoSe2 /SnS2 heterojunction is suitable for photocatalytic overall water splitting. This heterojunction possesses strong redox ability. The internal electric field can promote the separation of photoinduced carriers. The electronic properties of this heterojunction with strains are stable. The enhancement of absorption in this heterojunction is evident in visible light region.