4.6 Article

One-step thermal polymerization synthesis of nitrogen-rich g-C3N4 nanosheets enhances photocatalytic redox activity

Journal

RSC ADVANCES
Volume 12, Issue 52, Pages 33598-33604

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ra05867g

Keywords

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Funding

  1. National Key Research and Development Program of China [2021YFB3802400]
  2. National Natural Science Foundation of China [52161037, U20A20237, 51871065, 51971068]
  3. Scientific Research and Technology Development Program of Guangxi [AD19110037, AA19182014, AD17195073, AA17202030-1]
  4. Guangxi Natural Science Foundation [2017JJB150085, 2019GXNSFGA245005]
  5. Innovation Project of GUET Graduate Education, China [2022YCXS197]
  6. Guangxi Bagui Scholar Foundation
  7. Guangxi Collaborative Innovation Center of Structure and Property for New Energy and Materials
  8. Guangxi Advanced Functional Materials Foundation and Application Talents Small Highlands
  9. Chinesisch-Deutsche Kooperationsgruppe [GZ1528]
  10. Guilin Lijiang Scholar Foundation
  11. Science and Technology Development Project of Guilin [20210102-4, 20210216-1]

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In this study, nitrogen-rich g-C3N4 nanosheets were synthesized by a one-step thermal polymerization method. The self-doping and ultrathin structure of g-C3N4 resulted in excellent catalytic performance and the introduction of midgap states, achieving efficient separation of photogenerated carriers.
Graphitic carbon nitride (g-C3N4) has attracted enormous attention as a visible-light-responsive carbon-based semiconductor photocatalyst. However, fast charge recombination seriously limits its application. Therefore, it is urgent to modify the electronic structure of g-C3N4 to obtain excellent photocatalytic activity. Herein, we reported a one-step thermal polymerization synthesis of nitrogen-rich g-C3N4 nanosheets. Benefiting from the N self-doping and the ultrathin structure, the optimal CN-70 exhibits its excellent performance. A 6.7 times increased degradation rate of rhodamine B (K = 0.06274 min(-1)), furthermore, the hydrogen evolution efficiency also reached 2326.24 mu mol h(-1) g(-1) (lambda > 420 nm). Based on a series of characterizations and DFT calculations, we demonstrated that the N self-doping g-C3N4 can significantly introduce midgap states between the valence band and conduction band, which is more conducive to the efficient separation of photogenerated carriers. Our work provides a facile and efficient method for self-atom doping into g-C3N4, providing a new pathway for efficient photocatalysts.

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