913
Views
49
Crossref
48
WoS
50
Scopus
3
CSCD
Two-dimensional (2D) semiconductor heterojunctions are considered as an effective strategy to achieve fast separation of photoinduced carriers. Herein, a novel CoWO4/g-C3N4 (CWO/CN) p–n junction was synthesized using an electrostatic self-assembly method. The constructed 2D/2D p–n heterostructure had a rich hetero-interface, increased charge density, and fast separation efficiency of photoinduced carriers. The in-situ Kelvin probe force microscopy confirmed that the separation pathway of photoinduced carriers through the interface obeyed an II-scheme charge transfer mechanism. Experimental results and density functional theory calculations indicated the differences of work function between CWO and CN induced the generation of built-in electric field, ensuring an efficient separation and transfer process of photoinduced carriers. Under the optimized conditions, the CWO/CN heterojunction displayed enhanced photocatalytic H2 generation activity under full spectrum and visible lights irradiation, respectively. Our study provides a novel approach to design 2D/2D hetero-structured photocatalysts based on p–n type semiconductor for photocatalytic H2 generation.
This work was financially supported by Outstanding Talent Research Fund of Zhengzhou University, China Postdoctoral Science Foundation (Nos. 2020TQ0277 and 2020M682328), Central Plains Science and Technology Innovation Leader Project (No. 214200510006), and Postdoctoral Science Foundation of Henan province (No. 202002010). The DFT calculations are supported by Supercomputer Center in Zhengzhou University.