S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Chemical and Biological Engineering (화학생물공학부) Journal Papers (저널논문_화학생물공학부)
Complex Capacitance Analysis on Leakage Current Appearing in Electric Double-layer Capacitor Carbon Electrode
- Jang, Jong H.; Yoon, Songhun; Ka, Bok H.; Jung, Yong-Ho; Oh, Seung M.
- Issue Date
- Electrochemical Society
- J. Electrochem. Soc., 152, A1418 (2005)
- imaginary capacitance
profiles(Cim vs. log f) were theoretically derived for a cylindrical pore and multiple pore systems of nonuniform pore geometry.
The parallel RC circuit was assumed for the interfacial impedance, where R is the charge-transfer resistance for leakage current
and C the double-layer capacitance. The theoretical derivation illustrated that the resistive tail relevant to the leakage current
appears in addition to the capacitive peak, which was in accordance with the experimental data taken on the porous carbon
electrode. The electric double-layer capacitor (EDLC) parameters such as the extent of leakage current, total capacitance, and rate
capability were visually estimated from the imaginary capacitance profiles. The more quantitative EDLC parameters were obtained
by a nonlinear fitting to the experimental data.
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