Electrochemical impedance spectroscopy of porous electrodes: the effect of pore size distribution

被引:295
作者
Song, HK
Jung, YH
Lee, KH
Dao, LH
机构
[1] Pohang Univ Sci & Technol, Dept Chem Engn, Nam Ku, Pohang 790784, Kyungbuk, South Korea
[2] Pohang Univ Sci & Technol, Sch Environm Engn, Nam Ku, Pohang 790784, Kyungbuk, South Korea
[3] Inst Natl Rech Sci, Lab Rech Mat Avances, Varennes, PQ, Canada
关键词
porous electrode; transmission line model; electrochemical impedance spectroscopy; electrochemical capacitor; pore size distribution;
D O I
10.1016/S0013-4686(99)00121-8
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
A new model for the impedance of porous materials was developed. The transmission line model with pore size distribution (TLM-PSD) is based on the transmission line equivalent circuit, considering the effect of pore size distribution (PSD). The PSD was represented by an analytical distribution function, for example, the log normal distribution, With this model, impedance was a sole function of the representative penetrability alpha(mu) when the standard deviation a is constant. Phase angle at low frequency or high penetrability changes from -90 degrees at sigma = 0 to -45 degrees at sigma = infinity. This indicates that a wider distribution leads to more porous characteristics of impedance. Experimental impedance data of a gold powder electrode were successfully fitted with the TLM-PSD, (C) 1999 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:3513 / 3519
页数:7
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