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Citation: Jing Zou, Guodong Liao, Jizhou Jiang, Zhiguo Xiong, Saishuai Bai, Haitao Wang, Pingxiu Wu, Peng Zhang, Xin Li. In-situ Construction of Sulfur-doped g-C3N4/defective g-C3N4 Isotype Step-scheme Heterojunction for Boosting Photocatalytic H2 Evolution[J]. Chinese Journal of Structural Chemistry, ;2022, 41(1): 220102. doi: 10.14102/j.cnki.0254-5861.2021-0039 shu

In-situ Construction of Sulfur-doped g-C3N4/defective g-C3N4 Isotype Step-scheme Heterojunction for Boosting Photocatalytic H2 Evolution

  • 1.

    School of Environmental Ecology and Biological Engineering, School of Chemistry and Environmental Engineering, Key Laboratory of Green Chemical Engineering Process of Ministry of Education, Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education, Wuhan Institute of Technology, Wuhan 430205, China

  • 2.

    Key Laboratory of Rare Mineral, Ministry of Natural Resources, Geological Experimental Testing Center of Hubei Province, Wuhan 430034, China

  • 3.

    Semiconductor Electronic Special Gas of Hubei Engineering Research Center, Jingzhou, Hubei 434000, China

  • 4.

    State Center for International Cooperation on Designer Low-Carbon & Environmental Materials (CDLCEM), School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China

  • 5.

    Institute of Biomass Engineering, Key Laboratory of Energy Plants Resource and Utilization, Ministry of Agriculture and Rural Affairs, South China Agricultural University, Guangzhou 510642, China

Figures(6)

  • The rational construction of a high-efficiency step-scheme heterojunctions is an effective strategy to accelerate the photocatalytic H2. 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-dimethyl-formamide (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 propulsive integration of S-dopants contributes to the excellent fluffiness and dispersibility of lamellar g-C3N4. Moreover, the developed heterojunction 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 H2 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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