Nitrogen doped g-C3N4 with the extremely narrow band gap for excellent photocatalytic activities under visible light

By Dandan Zhu, Qixing Zhou. 2021

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Abstract In this work, nitrogen doping g-C3N4 (NCN) with the extremely narrow band gap was prepared and applied for the photodegradation of phenols. Experiments and DFT (Density functional theory) computation identified that N-doping introduced in the g-C3N4 matrix by substituting C atoms. DFT, PL (Photoluminescence) spectra, optical property characteristic and PEC (Photoelectrochemical) indicated that NCN possess extremely narrow band gap, efficient photogenerated carrier separation and the charge transfer, which enhanced the absorption of visible light and further promote the photocatalytic activity. As a result, NCN(2:2) showed about twice higher photodegradation efficiencies and 3 times rate constant than pristine g-C3N4. Radical trapping experimental show that •O2- radical and h+ served as crucial active species during the whole photodegradation reaction. This work provided a strategy to enhance the photocatalytic activity of photocatalysts via introduce foreign atoms in matrix.

Subfields: Electrical and Electronic Engineering, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/448d8944773f99e48ff1c2e98e16f5ac934c86a2