Dear colleagues,
I am conducting an electrochemical impedance spectroscopy (EIS) analysis of a system using Metrohm Autolab. I need to fit a line to the Nyquist plot of the impedance data, but I encounter some difficulties. When I select three points on the plot, the line obtained from the equivalent circuit does not follow the curve closely, and the parameters of the circuit are not consistent with the expected values. How can I increase the accuracy of the line fitting and the circuit parameters? I have attached an example of the plot and the circuit for your reference.
Thank you for your help
Dear Dr. Lounis Djenaoucine ,
as I have already done in a previous, similar question, I suggest you to have a look at the following, interesting and useful documents:
-Electrochemical Impedance Techniques Potentiostatic EIS by GAMRY Instruments
Available at: https://www.gamry.com/application-notes/EIS/potentiostatic-eis-tutorial/
-Basics of Electrochemical Impedance Spectroscopy by GAMRY Instruments
Available at: https://www.gamry.com/application-notes/EIS/basics-of-electrochemical-impedance-spectroscopy/
-Equivalent Circuit Modeling in EIS by Gamry Instruments
Available at: https://www.gamry.com/assets/Application-Notes/Equivalent-Circuit-Modeling-in-EIS.pdf
This note indicates a very important point. EIS data are commonly analyzed by fitting to an equivalent electrical circuit model. Most of the circuit elements in the model are common electrical elements such as resistors, capacitors, and inductors. To be useful, the elements in the model should have a basis in the physical electrochemistry of the system and not be chosen only because they best fit the curve obtained.
- Webinar Basics of Electrochemical Impedance Spectroscopy (EIS) by GAMRY Instruments
Available at: https://www.youtube.com/watch?v=GM0o1BbbXy8
- What is Electrochemical Impedance Spectroscopy (EIS)? By BioLogic
Available at: https://www.biologic.net/topics/what-is-eis/
- Electrochemical Impedance Spectroscopy (EIS) by Palmsens
Available at: https://www.palmsens.com/knowledgebase-article/electrochemical-impedance-spectroscopy-eis/
- Electrochemical Impedance Spectroscopy (EIS) Basics by PINEresearch
Available at: https://pineresearch.com/shop/kb/theory/eis-theory/eis-basics/
- Electrochemical Impedance Spectroscopy by LibreTexts ENGINEERING
Available at: https://eng.libretexts.org/Bookshelves/Materials_Science/Supplemental_Modules_(Materials_Science)/Insulators/Electrochemical_Impedance_Spectroscopy
Enjoy reading and my best regards, Pierluigi Traverso.
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