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Complex Capacitance Analysis of Porous Carbon Electrodes for Electric Double-Layer Capacitors

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Authors
Jang, Jong H.; Oh, Seung M.
Issue Date
2004-02-20
Publisher
Electrochemical Society
Citation
J. Electrochem. Soc., 151, A571 (2004)
Abstract
A new analytical methodology, complex capacitance analysis, is developed for porous carbons that are employed as electric
double-layer capacitor ~EDLC! electrodes. Based on the transmission line model, the imaginary capacitance profiles (Cim vs. log f)
are theoretically derived for a cylindrical pore and further extended to multiple pore systems. The theoretical derivation illustrates
that two important electrochemical parameters in EDLCs can be estimated from the peak-shaped imaginary capacitance plots: total
capacitance from the peak area and rate capability from the peak position. The usefulness of this analysis in estimating EDLC
parameters is demonstrated by applying to two sets of practical porous carbon electrodes. In addition, the penetrability distribution
curves that are derived from the experimental imaginary capacitance data using the log-normal assumption and discrete Fourier
transform allow us to estimate the pore structure of carbon electrodes.
ISSN
0013-4651
http://dx.doi.org/10.1149/1.1647572
Language
English
URI
http://hdl.handle.net/10371/5811
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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