Single and multi-frequency impedance characterization of symmetric activated carbon single capacitor cells

  • Suzana Sopčić University of Zagreb, Faculty of Engineering and Technology, Department of Electrochemistry, Marulićev trg 19, 10000 Zagreb
  • Davor Antonić University of Zagreb, Faculty of Engineering and Technology, Department of Electrochemistry, Marulićev trg 19, 10000 Zagreb
  • Zoran Mandić University of Zagreb, Faculty of Engineering and Technology, Department of Electrochemistry, Marulićev trg 19, 10000 Zagreb
  • Krešimir Kvastek Ruđer Bošković Institute, Bijenička c. 54, 10000 Zagreb
  • Višnja Horvat-Radošević Ruđer Bošković Institute, Bijenička c. 54, 10000 Zagreb
Keywords: Double-layer capacitor, electrical response, porous electrodes, storage capacitance, internal resistance


Electrochemical impedance spectroscopy (EIS) technique is used for characterization of single cell symmetric capacitors having different mass loadings of activated carbon (AC). Relevant values of charge storage capacitance (CT) and internal resistance (ESR) were evaluated by the single frequency and multi-frequency analyses of measured impedance spectra. Curve fittings were based on the non-ideal R-C model that takes into account the parasitic inductance, contributions from electrode materials/contacts and the effects of AC porosity. Higher CT and lower ESR values were obtained not only for the cell with higher mass of AC, but also using the single vs. multi-frequency approach. Lower CT and higher values of ESR that are generally obtained using the multi-frequency method and curve fittings should be related to the not ideal capacitive response of porous AC material and too high frequency chosen in applying the single frequency analysis.


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