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

doi:10.6023/A15030207

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

Article

类石墨烯碳材料的制备及其电容性能研究

苏善金, 来庆学, 梁彦瑜

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 E-mail:liangyy403@126.com
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

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 http://sioc-journal.cn.Project 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

Cite this article

Su Shanjin, Lai Qingxue, Liang Yanyu. Synthesis of Graphene-like Carbon Sheets (GLCS) and Its Supercapacitor Property[J]. Acta Chim. Sinica, 2015, 73(7): 735-740.

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类石墨烯碳材料的制备及其电容性能研究

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

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