Influence of cell configuration on measuring interfacial impedances between a solid electrolyte and an electrode

For AC impedance spectroscopy to measure interfacial impedances between an electrolyte and a working electrode in solid electrolyte cells with three electrodes, the experimental error that is caused by the cell configuration is analyzed using a numerical model. To simulate AC impedance spectra, potential and current distributions in the disk type cells are calculated for various frequencies, and the impedance between the reference electrode and the working electrode is estimated. From the calculation, it is clarified that the difference in the size between the working electrode and the counter electrode can cause the experimental error and the deformation of the impedance spectra from a simple semicircle. The influences of the material properties and the cell configuration on the error and the deformation of the impedance spectrum are discussed.