It is built in a modular layout to facilitate add-ons, modifications, and it is therefore possible with relative ease to add any desired equivalent circuit. PyEIS is an open-source platform that is able to simulate, evaluate data quality, fit, and plot electrochemical impedance spectroscopy data. Classically, kinetic contributions are referred to as charge-transfer resistances, double-layer as capacitors and their derivatives, and mass-transport have a wide range of terms. Electrochemical processes can be described through circuit elements and a combination of these are referred to as equivalent circuit elements that model the cell or interface in question. This can often be a difficult task as the response depends on a large parameter space, such as: electrode configuration, porosity, pore size morphology, reference electrode, distance between working- and reference electrode, interfacial layers that depends on, among other, electrolyte composition, current collectors, potential, temperature, etc. Electrochemical Impedance Spectroscopy can be a powerful analytical tool for the electrochemist as it can have the ability of separating kinetics, double-layers, adsorption, and mass-transport from a current/voltage response.
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February 2023
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