Chemical Research in Chinese Universities ›› 2026, Vol. 42 ›› Issue (2): 637-647.doi: 10.1007/s40242-025-5164-z

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Step-scheme 0D/2D Heterojunctions Based on Ag2S Nanoparticles/Graphite-C3N4 Nanosheets with Enhanced Visible-light Photocatalytic CO2 Reduction Performance

WANG Jian1,2, LI Xin2, QU Xin2,3, FENG Bo1,2, LI Xuefei1, LIU Yanqing2, WEI Maobin2   

  1. 1. College of Information Technology, Jilin Engineering Research Center of Optoelectronic Materials and Devices, Jilin Normal University, Siping 136000, P. R. China;
    2. Key Laboratory of Functional Materials Physics and Chemistry, Ministry of Education, College of Physics, Jilin Normal University, Changchun 130103, P. R. China;
    3. Department of Radiation Oncology, China-Japan Union Hospital, Jilin University, Changchun 130022, P. R. China
  • Received:2025-08-04 Online:2026-04-01 Published:2026-04-02
  • Contact: LI Xin,E-mail:xlwl@jlnu.edu.cn;QU Xin,E-mail:quxin515@jlu.edu.cn;WEI Maobin,E-mail:jlsdzccw@126.com E-mail:xlwl@jlnu.edu.cn;quxin515@jlu.edu.cn;jlsdzccw@126.com
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (No. 12204194), the Program for the Development of Science and Technology of Jilin Province, China (Item YDZJ202301ZYTS246, No. 20240601047RC), and the Program for the Science and Technology of Education Department of Jilin Province, China (Nos. JJKH20230507KJ, JJKH20250941KJ).

Abstract: Heterostructured photocatalysts are promising candidate materials in the field of photocatalysis. Heterojunctions play an important role in the separation of carriers in space. In this study, a 0D/2D step (S)-scheme heterojunctions were prepared by in-situ growth of Ag2S nanoparticles (NPs) onto porous graphite (g)-C3N4 nanosheets. Ag2S NPs effectively shortened the diffusion path of carriers, thus promoting interfacial charge migration and further improving surface photocatalytic activity. X-Ray photoelectron spectroscopy and photoelectrochemical tests indicated an internal electric field formed at the g-C3N4/Ag2S interface, which enabled efficient separation and enhanced the photocatalytic CO2 reduction activity while preserving the maximum redox capacity of photogenerated carriers. Under the irradiation of visible light, the CO yield of Ag2S/g-C3N4 composites was about 17.24 μmol·g-1·h-1 and their CH4 yield was about 2.36 μmol·g-1·h-1, both of which were better than those of Ag2S and g-C3N4. This work provides new insights into novel structures of S-scheme heterojunctions for photocatalytic CO2 reduction.

Key words: Step-scheme, Photocatalysis, CO2 reduction, 0D/2D heterojunction