Kinetics of double-layer charging/discharging of the activated carbon fiber cloth electrode: effects of pore length distribution and solution resistance |
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Authors: | Gyoung-Ja?Lee Email author" target="_blank">Su-Il?PyunEmail author Chang-Hee?Kim |
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Institution: | (1) Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea |
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Abstract: | The effects of pore length distribution (PLD) and solution resistance, Rsol, on the kinetics of double-layer charging/discharging of the activated carbon fiber cloth electrode (ACFCE) were investigated in a 30 wt% H2SO4 solution using nitrogen gas adsorption, a.c. impedance spectroscopy, the current transient technique, and cyclic voltammetry. The impedance spectra of the ACFCE were theoretically calculated based upon the transmission line model in consideration of the pore size distribution (PSD) and the PLD. From comparison of both the experimental and theoretical impedance spectra of the ACFCE, it is suggested that the deviation from the ideal impedance behavior of a cylindrical pore in the experimental impedance spectrum of the ACFCE is mainly ascribed to PLD, rather than to PSD. The cathodic current transients and cyclic voltammograms were theoretically calculated based upon the transmission line model as functions of the standard deviation of the PLD and Rsol. From the results, it is concluded that ion penetration into the pores is closely related to both and Rsol during double-layer charging/discharging of the ACFCE, that is, the larger and Rsol, the lower is the rate capability, thus causing higher retardation of ion penetration into the pores. |
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Keywords: | Activated carbon fiber cloth Pore length distribution Pore size distribution Solution resistance Transmission line model |
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