Interpreting electrochemical impedance spectroscopy (EIS) circuits

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Discussion Overview

The discussion revolves around interpreting electrochemical impedance spectroscopy (EIS) circuits, specifically focusing on understanding how different circuit configurations can yield the same Nyquist plot. Participants explore real-world scenarios that these circuits might represent and seek resources for deeper comprehension of complex EIS systems.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related

Main Points Raised

  • One participant, Electrogeek, expresses uncertainty about the interpretation of two circuits that produce the same Nyquist plot and seeks real-world applications for these configurations.
  • Another participant questions whether the inquiry is related to schoolwork and asks about the information sources available to Electrogeek.
  • Electrogeek clarifies that the inquiry is related to personal research and mentions previous readings on simpler systems like the Randles circuit.
  • A participant shares a Wikipedia article on dielectric spectroscopy and inquires about Electrogeek's background in calculating complex impedances and comfort with the associated mathematics.
  • Additional resources are provided, including a link to a Biologic website discussing EIS.
  • Electrogeek reiterates their initial question and shares a specific tutorial resource on EIS from a scientific journal.

Areas of Agreement / Disagreement

The discussion does not appear to reach a consensus, as participants express varying levels of familiarity with EIS and different approaches to understanding the circuits in question. Multiple perspectives on the complexity of EIS and its applications are present.

Contextual Notes

Participants have not fully explored the assumptions underlying the circuits or the mathematical steps involved in interpreting complex impedances. There is a reliance on external resources for clarification.

Who May Find This Useful

This discussion may be of interest to individuals new to electrochemical impedance spectroscopy, researchers looking for insights into circuit interpretation, and those seeking resources for understanding complex impedance calculations.

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
 
Engineering news on Phys.org
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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