Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 8, Issue 35, Pages 13459-13466Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c04372
Keywords
Photocatalysis; Pure water splitting; Red phosphorus; Carbon nitride; van der Waals heterojunction
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Funding
- National Natural Science Foundation of China [51888103, 51925602]
- China National Key Research and Development Plan Project [2018YFB1502000]
- Shaanxi Technical Innovation Guidance Project [2018HJCG-14]
- Opening Project of Key Laboratory of Green Chemistry of Sichuan Institutes of Higher Education [LYJ1804]
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Developing active photocatalysts using wide-spectrum light is crucial to promote the application of photocatalytic water splitting. Elemental red phosphorus (RP) has attracted much attention as a potential nonmetal photocatalyst owing to its low cost, earth abundance, and narrow bandgap. Herein, RP nano-sheets were synthesized and tightly combined with carbon nitride (CN) framework nanosheets to form RP/CN van der Waals (vdW) heterostructure. CN nanosheets could act as a substrate to generate RP nanosheets through a confinement effect. This hybrid photocatalyst could utilize the incident light with the wavelength longer than 620 nm for pure water splitting, with hydrogen production activity of 367.0 mu mol h(-1)g(-1) under full arc illustration and 239.8 mu mol h(-1)g(-1) under visible light irradiation. The improved photocatalytic property was ascribed to the wide light absorption and intimate electronic coupling between 2D RP and 2D CN for accelerated charge transfer. Instead of O-2, water was oxidized into H2O2 via a two-electron pathway, which could avoid the potential explosion by producing H-2 and O-2 simultaneously. This work proved the great potential of RP-based vdW heterostructures for solar-driven water splitting.
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