The effect of pore size distribution on the frequency dispersion of porous electrodes
SCIE
SCOPUS
- Title
- The effect of pore size distribution on the frequency dispersion of porous electrodes
- Authors
- Song, HK; Hwang, HY; Lee, KH; Dao, LH
- Date Issued
- 2000-03
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Abstract
- The transmission line model with pore size distribution (TLM-PSD) developed for blocking electrodes without faradaic reactions in our previous work was reformulated on the basis of the distribution of the penetrability coefficient alpha(0), which is a more generalized concept than the distribution of pore size. Impedances were simulated using the TLM-PSD model for four different pore size distributions (PSD). Although different shapes of the Nyquist curve was obtained depending upon the different PSD, all simulated impedances share a common point that an increase in the width of a distribution (P-sigma) leads to a more inclined Nyquist curve at high penetrability (alpha(mu)). This is because the effect of small pores on the total impedance increases with P-sigma. We fitted the experimental impedance data of a carbon membrane with the TLM-PSDs and the de Levie's model (TLM-delta). The fitting by TLM-PSD was successful while TLM-delta could not describe the impedance of the porous electrode at low frequency range. In addition, the geometric parameters estimated by TLM-PSD agreed with physically available values. (C) 2000 Elsevier Science Ltd. All rights reserved.
- Keywords
- pore size distribution; TLM-PSD; porous electrode impedance; ELECTROCHEMICAL IMMITTANCE SPECTROSCOPY; SINGLE-CRYSTAL ELECTRODES; IMPEDANCE MEASUREMENTS; NONCYLINDRICAL PORES; ANION ADSORPTION
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/20076
- DOI
- 10.1016/S0013-4686(99)00436-3
- ISSN
- 0013-4686
- Article Type
- Article
- Citation
- ELECTROCHIMICA ACTA, vol. 45, no. 14, page. 2241 - 2257, 2000-03
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