J. Mater. Sci. Technol. ›› 2022, Vol. 125: 128-144.DOI: 10.1016/j.jmst.2022.02.035

• Research Article • Previous Articles     Next Articles

Review on g-C3N4-based S-scheme heterojunction photocatalysts

Yunfeng Lia,*(), Zhiling Xiaa, Qing Yanga, Linxi Wangb,*(), Yan Xingc   

  1. aXi'an Key Laboratory of Textile Chemical Engineering Auxiliaries, College of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an 710000, China
    bLaboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China
    cJilin Provincial Key Laboratory of Advanced Energy Materials, Department of Chemistry, Northeast Normal University, Changchun 130024, China
  • Received:2021-10-30 Revised:2022-01-25 Accepted:2022-02-01 Published:2022-04-18 Online:2022-04-18
  • Contact: Yunfeng Li,Linxi Wang
  • About author:linxiwang91@126.com (L. Wang).
    * E-mail addresses: liyf377@nenu.edu.cn (Y. Li),

Abstract:

With the rapid development of economy and modern industry, serious environmental pollution and energy shortage have become major urgent challenges to the human society. Photocatalysis is a promising technology to provide green energy. As a typical metal-free polymer photocatalyst, g-C3N4 has attracted more and more attention due to its excellent performance. Unfortunately, the fast recombination of photo-induced charges, limited light response range as well as weak oxidation ability are still the key drawback that restrict the photocatalytic performance of g-C3N4. These problems can be effectively addressed by constructing g-C3N4-based heterojunctions with two or more semiconductor materials, during which the respective advantages can be integrated. Up to now, the various oxidation semiconductor photocatalysts have been tried to construct the novel S-scheme heterojunction photocatalysts with g-C3N4. Thus, this review provides a comprehensive introduction of g-C3N4-based S-scheme heterojunctions, including the main characteristics of the S-scheme heterojunction, photocatalytic mechanisms, design rules and preparation methods of g-C3N4-based S-scheme heterojunction photocatalysts. Moreover, this review summarizes recently reported works on the potential applications of g-C3N4-based S-scheme photocatalysts in various important photocatalytic reactions, including photocatalytic hydrogen production, photocatalytic degradation of contaminants, photo-reduction of CO2 into fuels, and photocatalytic sterilization. Finally, based on the current research progress, we propose some shortages in the preparation methods and applications of g-C3N4-based S-scheme heterojunctions, which are to be further investigated and resolved in this promising and creative research field.

Key words: Photocatalysis, Semiconductor, g-C3N4, Heterojunction, S-scheme