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Simulated impedance of diffusion in porous media
File(s)
Author(s)
Cooper, SJ
Bertei, A
Finegan, DP
Brandon, NP
Type
Journal Article
Abstract
This paper describes the use of a frequency domain, finite-difference scheme to simulate the impedance spectra of diffusion in porous microstructures. Both open and closed systems are investigated for a range of ideal geometries, as well as some randomly generated synthetic volumes and tomographically derived microstructural data. In many cases, the spectra deviate significantly from the conventional Warburg-type elements typically used to represent diffusion in equivalent circuit analysis. A key finding is that certain microstructures show multiple peaks in the complex plane, which may be misinterpreted as separate electrochemical processes in real impedance data. This is relevant to battery electrode design as the techniques for nano-scale fabrication become more widespread. This simulation tool is provided as an open-source MatLab application and is freely available online as part of the TauFactor platform.
Date Issued
2017-10-10
Date Acceptance
2017-07-25
Citation
Electrochimica Acta, 2017, 251 (1), pp.681-689
URI
URL
DOI
ISSN
0013-4686
Publisher
Elsevier
Start Page
681
End Page
689
Journal / Book Title
Electrochimica Acta
Volume
251
Issue
1
Copyright Statement
Creative Commons Attribution 4.0 International (CC BY 4.0)
License URL
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Identifier
https://www.sciencedirect.com/science/article/pii/S0013468617315931
Grant Number
EP/M014045/1
EP/K002252/1
EP/J016454/1
EP/J016454/1
EP/M02346X/1
EP/R020973/1
Subjects
Impedance
Microstructure
Diffusion
Tomography
EIS
Warburg
TauFactor
Publication Status
Published
Date Publish Online
2017-07-27