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Dye-sensitized graphitic carbon nitride (g-C3N4) for photocatalysis: a brief review

  • Nuonuo Zhang
  • Liu Wen
  • Jiaying YanEmail author
  • Yang LiuEmail author
Review
  • 17 Downloads

Abstract

Photocatalytic semiconductors by solar light have received significant attention for their application on photocatalytic H2 evolution, degradation of pollutants, CO2 reduction, and so on. Among them, graphitic carbon nitride (g-C3N4) has the properties of earth rich, metal-free, high physicochemical stability, and suitable electronic band structure and band gap for many kinds of photocatalyst reactions. However, the energy conversion efficiency still limited due to the low utilization efficiency in the longer wavelength. Dye sensitization is currently one of promising methods to extend the absorption response region of semiconductors, and enhances the separation and transportation of photogenerated electrons and holes between dyes and semiconductors. It may be a good candidate strategy to enhance photocatalysis efficiency, even though lack of stability and repeatability for these composites. In this article, we have summarized dye-sensitized g-C3N4 with different mechanisms for variety of photocatalysis process, the relationship between structure of dyes and photocatalytic activity. Especially, dyes in H2 evolution process are divided into metal-free organic dyes, phthalocyanines, and porphyrins in detail. Comparing to metal-free organic dyes, the absorption of phthalocyanines and porphyrins can easily move to near-infrared region, which lead to the enhancement of H2 evolution activity. It may provide a guidance of the structure designing and constructing for highly effective dye-sensitized g-C3N4 photocatalysts for various applications. At last, we shared our opinions on the challenges and perspectives of dyes on g-C3N4 for photocatalyst.

Keywords

Carbon nitride Dye sensitization H2 evolution CO2 reduction Pollutant degradation 

Notes

Acknowledgements

This work was supported by National Natural Science Foundation of China (No. 21606145), State Key Laboratory of Coordination Chemistry Foundation of Nanjing University (No. SKLCC1811).

Supplementary material

11696_2019_929_MOESM1_ESM.doc (95 kb)
Supplementary material 1 (DOC 95 kb)

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Copyright information

© Institute of Chemistry, Slovak Academy of Sciences 2019

Authors and Affiliations

  1. 1.College of Materials and Chemical Engineering, and Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion MaterialsChina Three Gorges UniversityYichangPeople’s Republic of China
  2. 2.State Key Laboratory of Coordination ChemistryNanjing UniversityNanjingPeople’s Republic of China

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