Electrochemical porosimetry: Deconvolution of distribution functions
Cited 4 times inCited 5 times in
- Electrochemical porosimetry: Deconvolution of distribution functions
- Song, Hyun-Kon; Jang, Jong H.; Kim, Jae Jeong; Oh, Seung M.
- Deconvolution; Distribution function; Fourier transform; Impedance; Low-pass filtering
- Issue Date
- ELSEVIER SCIENCE INC
- ELECTROCHEMISTRY COMMUNICATIONS, v.8, no.7, pp.1191 - 1196
- Discrete Fourier transform (DFT) was used to deconvolute the distribution of penetrability coefficient (alpha(0)-distribution, equivalent to pore size distribution) from electrochemical impedance data of porous electrodes. The working equation is the Fredholm. integral equation of the first kind to correlate macroscopic impedance data to a theoretical model describing microscopic signal with the alpha(0)-distribution. Simulated and experimental impedance data were tested. Noise observed at high frequencies in Fourier space was removed before inversely Fourier-transforming the alpha(0)-distribution from Fourier space to real space. The accuracy of alpha(0)-distributions deconvoluted by DFT depended on the number, frequency range and quality of impedance data. The examples in this work showed that fairly accurate alpha(0)-distributions could be obtained by DFT deconvolution. Most promising method was to use the alpha(0)-distribution obtained from DFT deconvolution as the first guess to shape the true alpha(0)-distribution. Then, accurate alpha(0)-distributions could be obtained by estimating parameters of the pre-assumed distributions by using complex nonlinear least square fitting.
- ; Go to Link
- Appears in Collections:
- ECHE_Journal Papers
- Files in This Item:
can give you direct access to the published full text of this article. (UNISTARs only)
Show full item record
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.