Oxygen self-doped g-C3N4 with tunable electronic band structure for unprecedentedly enhanced photocatalytic performance

Fangyan Wei, Yang Liu, Heng Zhao, Xiaoning Ren, Jing Liu, Tawfique Hasan, Lihua Chen, Yu Li, Bao Lian Su

Research output: Contribution to journalArticlepeer-review

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 performance. 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-C3N4via 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.

Original languageEnglish
Pages (from-to)4515-4522
Number of pages8
JournalNanoscale
Volume10
Issue number9
DOIs
Publication statusPublished - 1 Jan 2018

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