Acta Chim. Sinica ›› 2015, Vol. 73 ›› Issue (7): 735-740.DOI: 10.6023/A15030207 Previous Articles     Next Articles



苏善金, 来庆学, 梁彦瑜   

  1. 南京航空航天大学材料科学与技术学院 南京 210016
  • 投稿日期:2015-03-25 发布日期:2015-06-02
  • 通讯作者: 梁彦瑜
  • 基金资助:

    项目受国家自然科学基金面上(No. 21273114)和江苏省自然科学基金面上(No. BK2012791)资助.

Synthesis of Graphene-like Carbon Sheets (GLCS) and Its Supercapacitor Property

Su Shanjin, Lai Qingxue, Liang Yanyu   

  1. College of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016
  • Received:2015-03-25 Published:2015-06-02
  • Supported by:

    Supporting information for this article is available free of charge via the Internet at supported by the National Natural Science Foundation of China (Grant No. 21273114) and the Natural Science Foundation of Jiangsu Province (Grant No. BK2012791).

As a new kind of carbon material, graphene has unique two-dimensional (2D) structure and outstanding physicochemical properties, such as high electrical conductivity and large surface area (2675 m2/g). In recent years, graphene has exhibited great potential for application as electrode materials in supercapacitors. In this work, a layered graphic carbon nitride (g-C3N4) which was generated through polycondensation of melamine was employed as a 2D self-sacrificing template. Then, a nitrogen-doped graphene-like 2D carbon sheets (GLCS) was prepared by the calcination of melamine and terephthalaldehyde. This graphene synthesis method is a more facile and cost-effective route comparing with traditional synthetic methods, such as chemical exfoliation of graphite and chemical vapor deposition (CVD). In a typical synthesis, melamine was used as precursor of template and reactant of Schiff-base reaction. The g-C3N4 template was used to confine the as-formed polymer to the interlayer gaps at about 600 ℃. Then, as the temperature continued to rise, the g-C3N4 template undergoes complete thermolysis and the polymer between interlayer gaps was carbonized to be GLCS. Then, after activated by KOH, a porous a-GLCS with high specific surface area and pore volume was obtained. GLCS and a-GLCS were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET) surface area measurement, Raman spectroscopy etc. TEM and SEM results showed that GLCS showed well-defined two-dimensional structure, XPS analysis determined the nitrogen-containing functional groups present on the surface of the sample, BET surface area measurement showed that after activated by KOH, the surface area have been obviously improved from 262.8 m2/g to 478.5 m2/g. The electrochemical measurement showed that, at the current density of 1 A/g, the specific capacitance of GLCS and a-GLCS are 150 and 300 F/g respectively. When the current density increased up to 20 A/g the specific capacitance remained 100 and 200 F/g respectively. The increasing of the specific capacitance was considered to be due to the generation of microporous during the activation process.

Key words: template, Schiff-base reaction, graphene, activated, supercapacitors