J. Mater. Sci. Technol. ›› 2026, Vol. 265: 320-327.DOI: 10.1016/j.jmst.2025.09.038

• Research Article • Previous Articles     Next Articles

2D/2D COF/MOF S-scheme heterojunction boosts photocatalytic H2 evolution

Xiaoya Rena,1, Kaihui Huangb,1, Yixin Weia, Meng Caia, Mengjie Lib, Rongchen Shenb, Xin Lib,c,*, Guosheng Shaoa,*, Fujun Miaoa,*   

  1. aState Centre for International Cooperation on Designer Low-Carbon & Environmental Materials (CDLCEM), School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China;
    bInstitute of Biomass Engineering, Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China;
    cCollege of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China
  • Received:2025-05-22 Revised:2025-09-02 Accepted:2025-09-22 Published:2026-09-10 Online:2025-10-03
  • Contact: * E-mail addresses: Xinli@scau.edu.cn (X. Li), gsshao@zzu.edu.cn (G. Shao), miaofj@zzu.edu.cn (F. Miao).
  • About author:1These authors contributed equally to this work.

Abstract: Covalent organic frameworks (COFs) hold great promise for photocatalysis; however, their activity for photocatalytic hydrogen evolution is frequently hindered by the critical limitation of rapid charge recombination. Herein, we report an S-scheme MOF/COF heterojunction synthesized through a facile in-situ growth approach. This architecture was evaluated for its photocatalytic hydrogen production performance. This innovative S-scheme heterojunction architecture synergistically improves light harvesting, enhances redox capability, and facilitates effective separation and transport of photogenerated charge carriers and exciton dissociation, thus significantly boosting photocatalytic hydrogen evolution activity. Under optimal conditions, the COF/MOF S-scheme heterojunction exhibits a maximum photocatalytic hydrogen production rate of 276.01 mmol g-1 h-1, representing a 2.24-fold improvement over the parent COF. Comprehensive mechanistic studies, including in-situ XPS and femtosecond transient absorption spectroscopy, elucidate the S-scheme charge transfer pathway and promote charge separation dynamics, while the strategic integration of Ni metal nodes with Pt cocatalysts simultaneously optimizes charge transfer and active sites. These findings offer valuable insights for precisely designing various kinds of COF-based S-scheme heterojunctions, advancing sustainable solar-to-hydrogen energy conversion.

Key words: Photocatalytic hydrogen evolution, Covalent organic frameworks, S-scheme heterojunction, Charge separation mechanism, Metal-organic frameworks