J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (12): 2515-2520.DOI: 10.1016/j.jmst.2017.06.018

• Orginal Article • Previous Articles     Next Articles

Facile synthesis and superior photocatalytic and electrocatalytic performances of porous B-doped g-C3N4 nanosheets

Qian Yan, Gui-Fang Huang*(), Dong-Feng Li, Ming Zhang, An-Lian Pan, Wei-Qing Huang*()   

  1. Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha, 410082, China
  • Received:2016-12-16 Revised:2017-04-06 Accepted:2017-06-20 Online:2018-12-20 Published:2018-11-15
  • Contact: Huang Gui-Fang,Huang Wei-Qing

Abstract:

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.

Key words: B-doped, g-C3N4 nanosheets, Photocatalysts, Electrocatalysts