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Issue 6, 2018, Issue in Progress
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Oxygen functional groups improve the energy storage performances of graphene electrochemical supercapacitors

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Abstract

Graphene is a promising electrode material for supercapacitors due to its superior physical and chemical properties, but the influence of its oxygen functional groups on capacitive performance still remains somewhat uncertain. In this work, graphene sheets with different oxygen content have been prepared through thermal reduction in argon. Furthermore, oxidation and pore-forming treatment of graphene annealed at 800 °C are also performed to explore the important effect of oxygen functional groups. The effects of disorder degree, surface area and oxygen functional groups on the specific capacitance were explored systematically. The content and species of oxygen functional groups are found to be significant factors influencing the electrochemical supercapacitor performance of graphene electrodes. The specific capacitances of graphene annealed at 200, 400 and 800 °C are 201, 153 and 34 F g−1, respectively. However, the specific capacitance of graphene reduced at 800 °C can be increased to 137 F g−1 after nitric acid oxidation treatment, and is only 39 F g−1 after pore forming on graphene surface, demonstrating that the oxygen functional groups can improve the capacitive performances of graphene electrochemical supercapacitors.

Graphical abstract: Oxygen functional groups improve the energy storage performances of graphene electrochemical supercapacitors

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Publication details

The article was received on 14 Nov 2017, accepted on 07 Jan 2018 and first published on 12 Jan 2018


Article type: Paper
DOI: 10.1039/C7RA12425B
Citation: RSC Adv., 2018,8, 2858-2865
  • Open access: Creative Commons BY license
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    Oxygen functional groups improve the energy storage performances of graphene electrochemical supercapacitors

    H. Cao, X. Peng, M. Zhao, P. Liu, B. Xu and J. Guo, RSC Adv., 2018, 8, 2858
    DOI: 10.1039/C7RA12425B

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