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Title: Simulated impedance of diffusion in porous media

This paper describes the use of a frequency domain, finite-difference scheme to simulate the impedance spectra of diffusion in porous microstructures. We investigate both open and closed systems 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. Furthermore, 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.
 [1] ;  [2] ;  [3] ;  [2]
  1. Imperial College, London (United Kingdom). Dyson School of Design and Engineering
  2. Imperial College, London (United Kingdom). Electrochemical Science and Engineering, Earth Science and Engineering
  3. Univ. College London (UCL) (United Kingdom). Electrochemical Innovation Lab., Dept. of Chemical Engineering; National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 0013-4686
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Electrochimica Acta
Additional Journal Information:
Journal Volume: 251; Journal Issue: C; Journal ID: ISSN 0013-4686
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Country of Publication:
United States
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; impedance; microstructure; diffusion; tomography; EIS; Warburg; TauFactor
OSTI Identifier: