Chinese Journal of Catalysis ›› 2023, Vol. 52: 127-143.DOI: 10.1016/S1872-2067(23)64491-2

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High-crystalline g-C3N4 photocatalysts: Synthesis, structure modulation, and H2-evolution application

Binbin Zhaoa, Wei Zhonga, Feng Chena, Ping Wanga, Chuanbiao Bieb, Huogen Yua,b,*()   

  1. aState Key Laboratory of Silicate Materials for Architectures and School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, Hubei, China
    bLaboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, Hubei, China
  • Received:2023-05-27 Accepted:2023-07-17 Online:2023-09-18 Published:2023-09-25
  • Contact: *E-mail: huogenyu@163.com (H. Yu).
  • About author:Huogen Yu (Laboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences) received his PhD in 2007 from Wuhan University of Technology (WHUT). He served as a post-doctoral fellow at the University of Tokyo from 2008 to 2010. Since 2022, he has been working in Laboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences (Wuhan). His research interests are mainly focused on the high-performance photocatalytic materials for water splitting and environmental purification. He is the author or co-author of more than 180 peer-reviewed papers and was selected as the Most Cited Chinese Researchers in 2014-2022, based on the Scopus database from Elsevier. He was invited as a member of the editorial board of Chin. J. Catal. Since 2021.
  • Supported by:
    National Natural Science Foundation of China(U22A20147);National Natural Science Foundation of China(22075220);Natural Science Foundation of Hubei Province of China(2022CFA001)

Abstract:

Graphitic carbon nitride (g-C3N4) has received extensive attention in the photocatalytic field because of its low cost, nontoxicity, suitable bandgap structure, and high physicochemical stability among diverse photocatalysts. However, traditional g-C3N4 materials prepared by the high-temperature calcination of various organic precursors generally exhibit poor crystallinity and possess numerous internal and surface defects, leading to the rapid recombination of photo-excited charges. Constructing a highly crystalline g-C3N4 photocatalyst, as opposed to the traditional poorly crystalline g-C3N4, effectively reduces internal and surface defects, facilitating efficient separation and rapid transfer of photoexcited charges. As a result, the photocatalytic performance is significantly enhanced. In this review, recent progress in highly crystalline g-C3N4 photocatalysts is summarized. The microstructural characteristics of highly crystalline g-C3N4 photocatalysts are discussed in detail. Synthetic methods for highly crystalline g-C3N4, such as the salt-assisted (multicomponent salt and single-component salt), template, two-step calcination method, microwave-assisted method, and others, are meticulously presented. Additionally, various modification strategies for highly crystalline g-C3N4, encompassing bandgap engineering, heterojunction construction, and co-catalyst modification, are presented. Subsequently, a detailed description of the photocatalytic H2-evolution applications of highly crystalline g-C3N4 materials is given. Lastly, the paper concludes with a discussion on the outlook for highly crystalline g-C3N4 photocatalysts, aiming to offer novel insights into the design of highly efficient crystalline g-C3N4 photocatalysts.

Key words: Photocatalysis, High-crystalline g-C3N4, Synthesis, Modification, H2 evolution