EZ - Z vs E made easy

A python module to load, fit and plot impedance spectroscopy data. The datasets contain the impedance evolution as a function of the frequency of a perturbation (e.g. potential or light bias), recorded at different applied potentials. This data can be fitted using a model equivalent circuit or a custom model equation.

Installation

Using pip:

pip install echem-EZ

Or download the EZ folder on Github and add it to your python path.

Examples

• Detailed example, fitting with a model equivalent circuit: Loading, plotting and fitting electrochemical impedance spectroscopy data using an equivalent circuit model.
• Follow up example, fitting with a model equation: Loading, plotting and fitting intensity modulated photocurrent spectroscopy data using a model equation.

Dependencies

This code relies on the use of the sympy, scipy, numpy, pandas and matplotlib packages. It also uses the lmfit package (Matt Newville et al., LMFIT: Non-Linear Least-Square Minimization and Curve-Fitting for Python) and the SchemDraw package.

License

Licensed under the MIT License.

Contents

• Detailed example, fitting with a model equivalent circuit
  • Equivalent circuit definition
  • Evaluation of the equivalent circuit impedance vs angular frequency behavior
  • Loading and plotting the EIS data
  • Fitting and exporting fit results
• Follow up example, fitting with a model equation
  • Model equation definition and evaluation
  • Loading, plotting, fitting and displaying fit results
• Files formatting