• 文献标题:   Facile chemical synthesis of nitrogen-doped graphene sheets and their electrochemical capacitance
  • 文献类型:   Article
  • 作  者:   DU XS, ZHOU CF, LIU HY, MAI YW, WANG GX
  • 作者关键词:   nitrogen doping, graphene, specific capacitance, functionalization, reduced graphene oxide
  • 出版物名称:   JOURNAL OF POWER SOURCES
  • ISSN:   0378-7753
  • 通讯作者地址:   Univ Sydney
  • 被引频次:   56
  • DOI:   10.1016/j.jpowsour.2013.04.138
  • 出版年:   2013

▎ 摘  要

To improve the electrochemical performance of graphene materials, nitrogen-doped graphene sheets (NGS) were simultaneously reduced and functionalized with nitrogen (N) doping from graphene oxide (GO) by a simple process using 1 wt.% ammonia water solution as the reducing agent, nitrogen precursor and solvent. The NGS were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy-energy dispersive spectroscopy microanalysis, and differential scanning calorimetry. The thermal stability of NGS was much higher than that of GO. The N content in NGS was 4.4 at.% and a maximum specific capacitance up to 233.3 F g(-1) was obtained at 0.5 A g(-1). At 0.02 V s(-1), the NGS exhibited a specific capacitance of 140.3 F g(-1), which was over 8 times that of GO and nearly 2 times that of graphene without N-doping. These results revealed that N-doping of functional graphene provide remarkable improvements on the electrochemical capacitive performance of graphene materials. The NGS also showed high cycle stability of capacitive performance. (C) 2013 Elsevier B.V. All rights reserved.