Acta Phys. -Chim. Sin. ›› 2024, Vol. 40 ›› Issue (12): 2407020.doi: 10.3866/PKU.WHXB202407020

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Constructing Covalent Triazine Frameworks/N-Doped Carbon-Coated Cu2O S-Scheme Heterojunctions for Boosting Photocatalytic Hydrogen Production

Kaihui Huang1,2, Dejun Chen2, Xin Zhang3,*(), Rongchen Shen1,2,*(), Peng Zhang4,*(), Difa Xu5, Xin Li1,2,*()   

  1. 1 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
    2 Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China
    3 Hubei Key Lab Low Dimens Optoelect Mat 2 Devices, Hubei University of Arts and Science, Xiangyang 441053, Hubei Province, China
    4 State Centre for International Cooperation on Designer Low-Carbon 2 Environmental Materials (CDLCEM), School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
    5 Hunan Key Laboratory of Applied Environmental Photocatalysis, Changsha University, Changsha 410022, China
  • Received:2024-07-21 Revised:2024-09-18 Accepted:2024-09-19 Published:2024-11-09
  • Contact: Email: xinli@scau.edu.cn (Xin Li)xinzhang@hbuas.edu.cn (Xin Zhang)shenrongchenscau@163.com (Rongchen Shen)zhangp@zzu.edu.cn (Peng Zhang)
  • About author:

    †These authors contributed equally to this work.

  • Supported by:
    The project was supported from the National Natural Science Foundation of China(22378148); The project was supported from the National Natural Science Foundation of China(21975084); The project was supported from the National Natural Science Foundation of China(2230082074); Natural Science Foundation of Guangdong Province(2024A1515012433)

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Abstract:

The development of efficient photocatalysts for hydrogen production is crucial in sustainable energy research. In this study, we designed and prepared a Covalent Triazine Framework (CTF)-Cu2O@NC composite featuring an S-scheme heterojunction structure aimed at enhancing the photocatalytic hydrogen production. The light absorption capacity, electron-hole separation efficiency and H2-evolution activity of the composite were significantly enhanced due to the synergistic effects of the nitrogen-doped carbon (NC) layer and the S-scheme heterojunction. Structural and photoelectrochemical characterization of the system reveal that the S-scheme heterojunctions not only enhance the separation efficiency of photogenerated carriers but also maintain the strong redox capabilities to further promote the photocatalytic reactions. Moreover, the NC layer could simultaneously reduce the photocorrosion of Cu2O and promote the electron transfer. Experimental results demonstrate that the CTF-7% Cu2O@NC composite shows outstanding hydrogen-production performance under visible light, achieving 15645 μmol∙g−1∙h−1, significantly surpassing the photocatalytic activity of pure CTF (2673 μmol∙g−1∙h−1). This study introduces a novel approach to the development of efficient and innovative photocatalytic materials, strongly supporting the advancement of sustainable hydrogen energy.

Key words: Photocatalytic hydrogen evolution, Cu2O@NC, Covalent triazine frameworks (CTF), S-scheme heterojunction, Nitrogen doped carbon