Graphitic carbon nitride nanosheets made by different methods as electrode material for supercapacitors


In this work, we have synthetized graphitic carbon nitride (g-C3N4) nanosheets by chemical oxidation method and thermal oxidation method. The properties of the prepared g-C3N4 nanosheets were analyzed using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and transmission electron microscopy (TEM), and their electrochemical performance were further investigated using cyclic voltammetry (CV), electrochemical impedance spectrometry (EIS), and chronopotentiometry (GCD). The g-C3N4, the g-C3N4 after oxidation, and the g-C3N4 after thermal oxidation show different electrochemical properties. More importantly, the specific capacitance of g-C3N4 nanosheets after thermal oxidation of 580 °C (170.1 F g−1) is higher than g-C3N4 (127.7 F g−1) and g-C3N4 after 12 M sulfuric acid (133.6 F g−1) at a current density of 0.5 A g−1. And an excellent cyclic stability was obtained with a capacity retention of approximately 95.9% after 1000 cycles in a 2 M KOH solutions. Further, g-C3N4 nanosheets after thermal oxidation of 580 °C show good energy density of 3.740 wh/kg and power density of 99.46 w/kg characteristics superior application potential for high performance energy storage devices.

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We are grateful for the help of Analytical and Testing Center of Southwest University of Science and Technology.


This work was supported by Independent Research Project of State Kay Laboratory of Environmentally Friendly Energy Materials (grant no.19fksy0112).

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Correspondence to Huiwei Liao.

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Zhang, X., Liao, H., Liu, X. et al. Graphitic carbon nitride nanosheets made by different methods as electrode material for supercapacitors. Ionics 26, 3599–3607 (2020).

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  • Graphitic carbon nitride nanosheets
  • Chemical oxidation
  • Thermal oxidation
  • Electrode material
  • Supercapacitor