CUED Publications database

Oxygen Self-doped g-C3N4 with Tunable Electronic Band Structure for Unprecedentedly Enhanced Photocatalytic Performance

Wei, F and Liu, Y and Zhao, H and Ren, X and Liu, J and Hasan, T and Chen, L and Li, Y and Su, B-L (2018) Oxygen Self-doped g-C3N4 with Tunable Electronic Band Structure for Unprecedentedly Enhanced Photocatalytic Performance. Nanoscale, 10. pp. 4515-4522. ISSN 2040-3364 (Unpublished)

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Abstract

As a fascinating conjugated polymer, graphitic carbon nitride (g-C3N4) has attracted much attention for solving the worldwide energy shortage and environmental pollution. In this work, for the first time we report oxygen self-doping of solvothermally synthesized g-C3N4 nanospheres with tunable electronic band structure via ambient air exposure for unprecedentedly enhanced photocatalytic perfromance. Various measurements, such as XPS, Mott–Schottky plots, and density functional theory (DFT) calculations reveal that such oxygen doping can tune the intrinsic electronic state and band structure of g-C3N4 via the formation of C-O-C bond. Our results show that the oxygen doping content can be controlled by the copolymerization of the precursors. As a consequence, the oxygen doped g-C3N4 shows excellent photocatalytic performance, with an RhB photodegradation rate of 0.249 min-1 and a hydrogen evolution rate of 3174 μmol h-1 g-1, >35 times and ~4 times higher than that of conventional thermally made pure g-C3N4 (0.007 min-1 and 846 μmol h-1 g-1, respectively) under visible light. Our work introduces a new route for the rational design and fabrication of doping modified g-C3N4 photocatalyst for efficient degradation of organic pollutants and H2 production.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 17 Feb 2018 20:06
Last Modified: 25 Jun 2020 09:51
DOI: 10.1039/C7NR09660G