Common Equivalent-circuit Models

In the following help sessions we show some common models for equivalent circuits. These models can be used to interpret simple EIS data. Many of these models have been included as standard models in the Electrochemical Impedance Spectroscopy analysis package.

Modeling Overview

Model #1 — A Purely Capacitive Coating

Model #2 — Randles Cell

Model #3 — Mixed Kinetic and Diffusion Control

Model #4 — Coated Metal

Non-linear Least Squares Fitting

Uniqueness of Models