Facile synthesis and superior photocatalytic and electrocatalytic performances of porous B-doped g-C3N4 nanosheets
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2018年第12期
论文作者：Qian Yan Gui-Fang Huang Dong-Feng Li Ming Zhang An-Lian Pan Wei-Qing Huang
文章页码：2515 - 2520
摘 要：As a low-cost visible-light-driven metal-free catalyst, graphitic carbon nitride（g-C3N4） has attracted increasing attention due to its wide applications for solar energy conversion, environmental purification,and organic photosynthesis. In particular, the catalytic performance of g-C3N4 can be easily modulated by modifying morphology, doping, and copolymerization. Simultaneous optimization, however, has little been achieved. Herein, a facile one-pot strategy is developed to synthesize porous B-doped g-C3N4 nanosheets by using H3BO3 and urea as the precursor during thermal polymerization. The resultant B-doped g-C3N4 nanosheets retain the original framework of bulk g-C3N4, while induce prominently enhanced visible light harvesting and narrowing band gap by 0.32 eV compared to pure g-C3N4. Moreover, the adsorption capacity and photodegradation kinetics of methylene blue（MB） under visible light irradiation over B-doped g-C3N4 nanosheets can be improved by 20.5 and 17 times, respectively. The synthesized porous B-doped g-C3N4 nanosheets also exhibit higher activities than pure g-C3N4 as bifunctional electrocatalyst for both oxygen evolution reaction（OER） and oxygen reduction reaction（ORR）. The enhanced catalyst performance of porous B-doped g-C3N4 nanosheets stems from the strong synergistic effect originating from the larger exposed active sites generated by the exfoliation of g-C3N4 into nanosheets and the porous structure, as well as the better conductivity owing to B-doping. This work provides a simple, effective, and robust method for the synthesis of g-C3N4-based nanomaterial with superior properties to meet the needs of various applications.
Qian Yan，Gui-Fang Huang，Dong-Feng Li，Ming Zhang，An-Lian Pan，Wei-Qing Huang
Department of Applied Physics,School of Physics and Electronics,Hunan University
摘 要：As a low-cost visible-light-driven metal-free catalyst, graphitic carbon nitride（g-C3N4） has attracted increasing attention due to its wide applications for solar energy conversion, environmental purification,and organic photosynthesis. In particular, the catalytic performance of g-C3N4 can be easily modulated by modifying morphology, doping, and copolymerization. Simultaneous optimization, however, has little been achieved. Herein, a facile one-pot strategy is developed to synthesize porous B-doped g-C3N4 nanosheets by using H3BO3 and urea as the precursor during thermal polymerization. The resultant B-doped g-C3N4 nanosheets retain the original framework of bulk g-C3N4, while induce prominently enhanced visible light harvesting and narrowing band gap by 0.32 eV compared to pure g-C3N4. Moreover, the adsorption capacity and photodegradation kinetics of methylene blue（MB） under visible light irradiation over B-doped g-C3N4 nanosheets can be improved by 20.5 and 17 times, respectively. The synthesized porous B-doped g-C3N4 nanosheets also exhibit higher activities than pure g-C3N4 as bifunctional electrocatalyst for both oxygen evolution reaction（OER） and oxygen reduction reaction（ORR）. The enhanced catalyst performance of porous B-doped g-C3N4 nanosheets stems from the strong synergistic effect originating from the larger exposed active sites generated by the exfoliation of g-C3N4 into nanosheets and the porous structure, as well as the better conductivity owing to B-doping. This work provides a simple, effective, and robust method for the synthesis of g-C3N4-based nanomaterial with superior properties to meet the needs of various applications.
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