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

被引:280
作者
Wei, Fangyan [1 ]
Liu, Yang [1 ]
Zhao, Heng [1 ]
Ren, Xiaoning [1 ]
Liu, Jing [1 ]
Hasan, Tawfique [2 ]
Chen, Lihua [1 ]
Li, Yu [1 ]
Su, Bao-Lian [1 ,3 ,4 ]
机构
[1] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, 122 Luoshi Rd, Wuhan 430070, Hubei, Peoples R China
[2] Univ Cambridge, Cambridge Graphene Ctr, 9 JJ Thomson Ave, Cambridge CB3 0FA, England
[3] Univ Namur, Lab Inorgan Mat Chem, 61 Rue Bruxelles, B-5000 Namur, Belgium
[4] Univ Cambridge, Clare Hall,Herschel Rd, Cambridge CB3 9AL, England
基金
国家重点研发计划; 中国国家自然科学基金;
关键词
GRAPHITIC CARBON NITRIDE; FACILE SYNTHESIS; H-2; EVOLUTION; HIGH-EFFICIENCY; NANOSHEETS; MONOLAYER; PHOTOOXIDATION; SEMICONDUCTORS; IRRADIATION; COMPOSITE;
D O I
10.1039/c7nr09660g
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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-C(3)N(4)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 mol h(-1) g(-1), >35 times and approximate to 4 times higher than that of conventional thermally made pure g-C3N4 (0.007 min(-1) and 846 mol 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 H-2 production.
引用
收藏
页码:4515 / 4522
页数:8
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