J. Mater. Sci. Technol. ›› 2023, Vol. 162: 1-10.DOI: 10.1016/j.jmst.2023.03.045

• Research Article •     Next Articles

3D ordered macroporous sulfur-doped g-C3N4/TiO2 S-scheme photocatalysts for efficient H2O2 production in pure water

Zicong Jianga, Qing Longa, Bei Chenga, Rongan Heb, Linxi Wangc,*   

  1. aState Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;
    bHunan Key Laboratory of Applied Environmental Photocatalysis, Changsha University, Changsha 410022, China;
    cLaboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China
  • Received:2023-01-06 Revised:2023-03-05 Accepted:2023-03-15 Published:2023-11-01 Online:2023-05-15
  • Contact: *E-mail address: linxiwang91@126.com (L. Wang).

Abstract: Photocatalytic hydrogen peroxide (H2O2) production offers a clean and cost-efficient alternative to the traditional anthraquinone oxidation approach. Herein, a step-scheme (S-scheme) heterojunction photocatalyst is fabricated by coupling TiO2 with three dimensionally ordered macroporous sulfur-doped graphitic carbon nitride (3DOM SCN/T) by electrostatic self-assembly. The optimized photocatalyst achieved a high photocatalytic H2O2 production activity with a yield of 2128 μmol h-1g-1 without the addition of hole scavengers. The remarkable performance was attributed to the synergy between the 3DOM framework and the S-scheme heterojunction. The former enhances light harvesting and provides abundant active sites for surface reactions, while the latter promotes the spatial separation of photogenerated carriers and enhances the redox power. Finally, the mechanism of photocatalytic H2O2 production over the 3DOM SCN/T S-scheme composite is proposed. This work provides novel insights into the development of efficient photocatalysts for H2O2 production from water and O2.

Key words: Photocatalysis, Step-scheme heterojunction, Three dimensionally ordered macroporous, Hydrogen peroxide, O2 reduction reaction