Analytical Solution for the Impedance of a Porous Electrode
- 1 January 2004
- journal article
- research article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 151 (6) , A905-A913
- https://doi.org/10.1149/1.1739218
Abstract
A macrohomogeneous model is presented for a porous electrode that includes coupled potential and concentration gradients with linear kinetics. The equations are solved to obtain an analytical expression for the impedance of a porous electrode. Complex plane plots are presented that illustrate two well-defined arcs: a kinetic arc and a diffusion arc with their time constants far apart. The effects of parameters such as exchange current density, porosity, diffusion coefficient, thickness, and interfacial area on the impedance spectra are presented. The usefulness of the analytical solution in investigating the effect of solution phase diffusion is also presented. (C) 2004 The Electrochemical Society.Keywords
This publication has 15 references indexed in Scilit:
- Estimation of Diffusion Coefficient of Lithium in Carbon Using AC Impedance TechniqueJournal of the Electrochemical Society, 2002
- Computer Simulations of the Impedance Response of Lithium Rechargeable BatteriesJournal of the Electrochemical Society, 2000
- Double‐Layer Capacitance in a Dual Lithium Ion Insertion CellJournal of the Electrochemical Society, 1999
- Porous electrodes in the presence of a concentration gradientJournal of Electroanalytical Chemistry, 1997
- In Situ Conductivity Measurements of LiCoO2 Film during Lithium Insertion/Extraction by Using Interdigitated Microarray ElectrodesJournal of the Electrochemical Society, 1996
- Impedance of porous electrodesJournal of Electroanalytical Chemistry, 1995
- Theory of the electrochemical impedance of macrohomogeneous porous electrodesElectrochimica Acta, 1993
- Couple axial gradients of potential and concentration in a cylindrical pore electrode: an impedance modelJournal of Electroanalytical Chemistry and Interfacial Electrochemistry, 1985
- Impedance of a porous electrode with an axial gradient of concentrationJournal of Applied Electrochemistry, 1984
- Theory of flooded porous electrodesJournal of Electroanalytical Chemistry and Interfacial Electrochemistry, 1969