期刊
CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
卷 41, 期 1, 页码 2201025-2201033出版社
CHINESE JOURNAL STRUCTURAL CHEMISTRY
DOI: 10.14102/j.cnki.0254-5861.2021-0039
关键词
sulfur-doping; defects; isotype step-scheme heterojunction; g-C3N4; photocatalytic H-2
资金
- National Natural Science Foundation of China [62004143]
- Central Government Guided Local Science and Technology Development Special Fund Project [2020ZYYD033]
- Natural Science Foundation of Hubei Province [2021CFB133]
- Opening Fund of Key Laboratory of Rare Mineral Ministry of Natural Resources [202005]
- Open Research Fund of Key Laboratory of Material Chemistry for Energy Conversion and Stor-age (HUST), Ministry of Education [2021JYBKF05]
- Opening Fund of Key Laboratory for Green Chemical Process of Ministry of Education of Wuhan Institute of Technology [GCP202101]
- Innovation Project of Engineering Re-search Center of Phosphorus Resources Development and Utilization of Ministry of Education [LCX2021003]
A novel isotype step-scheme heterojunction with rich defects and catalytically active sites is successfully developed by polymerizing N,N-dimethylformamide (DMF) and urea with sulfur (S) powder. The simultaneous introduction of S-doping and defects greatly improves the separation, transfer, and recombination efficiency of photo-excited electron-hole pairs.
The rational construction of a high-efficiency stepscheme heterojunctions is an effective strategy to accelerate the photocatalytic H-2. Unfortunately, the variant energy-level matching between two different semiconductor confers limited the photocatalytic performance. Herein, a newfangled graphitic-carbon nitride (g-C3N4) based isotype step-scheme heterojunction, which consists of sulfur-doped and defective active sites in one microstructural unit, is successfully developed by in-situ polymerizing N,N-dimethylformamide (DMF) and urea, accompanied by sulfur (S) powder. Therein, the polymerization between the amino groups of DMF and the amide group of urea endows the formation of rich defects. The propultion exhibits a significantly enlarged surface area, thus leading to the more exposed catalytically active sites. Most importantly, the simultaneous introduction of S-doping and defects in the units of g-C3N4 also results in a significant improvement in the separation, transfer and recombination efficiency of photo-excited electron-hole pairs. Therefore, the resulting isotype step-scheme heterojunction possesses a superior photocatalytic H-2 evolution activity in comparison with pristine g-C3N4. The newly afforded metal-free isotype step-scheme heterojunction in this work will supply a new insight into coupling strategies of heteroatoms doping and defect engineering for various photocatalytic systems.
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