Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (11): 2745-2753.doi: 10.3866/PKU.WHXB201208221

• PHYSICAL CHEMISTRY OF MATERIALS • Previous Articles     Next Articles

Preparation of Nitrogen-Doped Graphene and Its Supercapacitive Properties

SU Peng1, GUO Hui-Lin1, PENG San1, NING Sheng-Ke2   

  1. 1 Key Laboratory of Synthetic and Natural Functional Molecule Chemistry, College of Chemistry and Materials Science, Northwest University, Xi’an 710069, P. R. China;
    2 Industry Training Center, Xi’an Technological University, Xi’an 710021, P. R. China
  • Received:2012-05-29 Revised:2012-08-21 Published:2012-10-17
  • Supported by:

    The project was supported by the Scientific Research Foundation of Education Bureau of Shaanxi Province, China (09JK747).

Abstract:

Nitrogen-doped graphene was synthesized by the hydrothermal method with graphene oxide (GO) as the raw material and urea as the reducing-doping agent. The morphology, structure, and components of the as-produced graphene were characterized by scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, nitrogen adsorption-desorption analysis, and electrical conductivity measurements. The results showed that nitrogen was doped into the graphene plane at the same time as the GO sheets were reduced, and the nitrogen content was between 5.47%-7.56% (atomic fraction). In addition, the electrochemical performance of the graphene was tested. Nitrogen-doped graphene with a nitrogen content of 7.50% showed excellent capacitive behavior and long cycle life. The first cycle specific discharge capacitance for the material was 184.5 F·g-1 when cycled at 3 A·g-1, and 12.4% losses were found after 1200 cycles in anaqueous electrolyte of 6 mol·L-1 KOH.

Key words: Graphene, Nitrogen doped, Urea, Hydrothermal method, Supercapacitor

MSC2000: 

  • O646