Simulated impedance of diffusion in porous media

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Title: Simulated impedance of diffusion in porous media
Author(s): Cooper, SJ
Bertei, A
Finegan, DP
Brandon, NP
Item 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.
Publication Date: 25-Jul-2017
Date of Acceptance: 25-Jul-2017
URI: http://hdl.handle.net/10044/1/50230
DOI: https://dx.doi.org/10.1016/j.electacta.2017.07.152
ISSN: 0013-4686
Publisher: Elsevier
Start Page: 681
End Page: 689
Journal / Book Title: Electrochimica Acta
Volume: 251
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/K002252/1
EP/M014045/1
Copyright Statement: Creative Commons Attribution 4.0 International (CC BY 4.0)
Keywords: Impedance
Microstructure
Diffusion
Tomography
EIS
Warburg
TauFactor
03 Chemical Sciences
09 Engineering
02 Physical Sciences
Energy
Publication Status: Published
Appears in Collections:Faculty of Engineering
Dyson School of Design Engineering



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