Journal of Inorganic Materials, Volume. 34, Issue 6, 625(2019)

Preparation of Cork-derived Porous Activated Carbon for High Performance Supercapacitors

Wei-Jia XU... Da-Ping QIU, Shi-Qiang LIU, Min LI* and Ru YANG* |Show fewer author(s)
Author Affiliations
  • Beijing Key Laboratory of Electrochemical Process and Technology for Materials, The State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
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    Figures & Tables(11)
    Schematic illustration of the preparation process for cork-derived porous activated carbon sheets and application of supercapacitor
    TG/DTG curves of raw cork in a flow of nitrogen gas
    (a, d) SEM and (b, c, e, f) TEM images of (a-c) CC and (d-f) COAC-4.5
    (a) N2 (77 K) adsorption/desorption isotherms and (b) pore size distribution curves of COAC-n samples
    XRD patterns of the COAC-n samples
    (a) XPS spectra of COAC-n, (b) C1s and (c) O1s XPS spectra of COAC-4.5
    Electrochemical performance characteristics of COAC-n measured in a three-electrode system in the 6 mol/L KOH electrolyte: CV curves at (a) 1 mV/s and (b) 200 mV/s; (c) Galvanostatic charge/discharge curves at a current density of 0.1 A/g; (d) Specific capacitances at different current densities; (e) Nyquist plots in the frequency range from 10 kHz to 10 mHz with inset showing magnified figure of arc part
    Electrochemical performance of COAC-4.5 measured in two electrode system with 6 mol/L KOH electrolyte:(a), (b) CV curves at different scan rates; (c) Galvanostatic charge-discharge curves at different current densities; (d) Specific capacitances for a single electrode at different current densities; (e) Ragone plot of the symmetrical system; (f) Cycling stability at a current density of 5 A/g and inset is the charge-discharge curves of first cycle and 5000th cycle
    Electrochemical performance of COAC-4.5 measured in two electrode system with 1 mol/L Na2SO4 electrolyte: (a) CV curves of the cell operated in different voltage windows at a scan rate of 50 mV/s; (b) Galvanostatic charge/discharge curves of the cell at various current densities; (c) Specific capacitances for a single electrode at different current densities; (d) Ragone plot of COAC-4.5 and other carbon-based symmetrical supercapacitors
    • Table 1. Porosity parameters of the COAC-n samples

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      Table 1. Porosity parameters of the COAC-n samples

      SamplesSBET/(m2∙g-1)aDave/nmVt/(cm3∙g-1)DFT Method
      S<1 nm/(m2∙g-1)S1-2 nm/(m2∙g-1)S2-4 nm/(m2∙g-1)V<1 nm/(cm3∙g-1)V1-2 nm/(cm3∙g-1)V2-4 nm/(cm3∙g-1)
      COAC-3.510442.190.571097115290.340.080.04
      COAC-4.021692.201.199755542210.330.370.26
      COAC-4.523122.221.2811914852470.400.350.29
      COAC-5.019292.181.0510874231720.360.290.21
    • Table 2. C, O and N contents of COAC-n samples from XPS analysis

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      Table 2. C, O and N contents of COAC-n samples from XPS analysis

      SamplesN/at%C/at%O/at%O-I/at%O-II/at%O-III/at%
      COAC-3.586.6513.355.854.582.92
      COAC-4.01.4281.5117.077.875.783.42
      COAC-4.51.3486.1212.544.043.774.73
      COAC-5.01.3782.7915.847.785.242.82
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    Wei-Jia XU, Da-Ping QIU, Shi-Qiang LIU, Min LI, Ru YANG. Preparation of Cork-derived Porous Activated Carbon for High Performance Supercapacitors[J]. Journal of Inorganic Materials, 2019, 34(6): 625

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    Paper Information

    Category: RESEARCH PAPER

    Received: Sep. 13, 2018

    Accepted: --

    Published Online: Sep. 24, 2021

    The Author Email: LI Min (limin9936@163.com), YANG Ru (ruyang@mail.buct.edu.cn)

    DOI:10.15541/jim20180426

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