Interpreting electrochemical impedance spectroscopy (EIS) circuits

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Electrochemical impedance spectroscopy (EIS) is being explored through two circuits that yield the same Nyquist plot, with the left-most resistor indicating solution resistance. The discussion seeks to connect these circuits to real-world scenarios and enhance understanding of more complex systems beyond basic models like the Randles circuit. Participants suggest various resources, including Wikipedia articles on dielectric spectroscopy and complex impedance, to aid in comprehension. There is an emphasis on the need for a solid mathematical foundation to interpret complex impedances effectively. Overall, the conversation highlights the importance of deeper research and understanding in EIS applications.
electrogeek
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Hi all,

I'm fairly new to electrochemical impedance spectroscopy (EIS). On some slides I was given, I have been provided with two circuits which would produce the same nyquist plot. I was wondering what real-world scenario these circuits would relate to. I know that the left-most resistor in each represents the resistance of the solution, but am unsure about the rest of each circuit. Any suggestions would be greatly appreciated, or resources which I can look at to get a better understanding.

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Best wishes,

Electrogeek
 
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Welcome to PF.

Is this for schoolwork? What information sources do you have for this work?
 
This is my own research. I've read a few tutorials that only consider simple systems (e.g: Randles circuit), but am looking to see how more complex scenarios fit.
 
electrogeek said:
I'm fairly new to electrochemical impedance spectroscopy (EIS). On some slides I was given, I have been provided with two circuits which would produce the same nyquist plot. I was wondering what real-world scenario these circuits would relate to. I know that the left-most resistor in each represents the resistance of the solution, but am unsure about the rest of each circuit. Any suggestions would be greatly appreciated, or resources which I can look at to get a better understanding.
“Electrochemical Impedance Spectroscopy ─ A Tutorial” by Alexandros Ch. Lazanas and Mamas I. Prodromidis (ACS Meas. Sci. Au 2023, 3, 162−193)

https://pubs.acs.org/doi/full/10.1021/acsmeasuresciau.2c00070
 
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