This Nyquist plot from EIS I have gotten using SS|SPE|SS electrode setup for my hydrogel samples. How can i find the conductivity of my hydrogel? Literature review has made me confused because in some papers bulk resistance has been calculated using the high frequency intercept of the semi circle and in other cases the bulk resistance has been calculated using low frequency intercept of the semicircle. Please guide me what equivalent circuit can i utilize and how to find out the conductivity?
Hi Saad Kiani
When I needed to figure out how to use EIS to find the ionic conductivity of a solid-state electrolyte, I went through this tutorial guide paper:
Electrochemical Impedance Spectroscopy─A Tutorial
https://doi.org/10.1021/acsmeasuresciau.2c00070
Keep an eye for the corrections that were added later on (some typos and incorrect equations).
Hope it helps as much as it did for me!
Best,
where L is the electrolyte thickness and A is the electrode area.
Measure thickness L (in cm) and electrode area A (in cm2)
bulk resistance Rb(Ω) from the Nyquist plot as above.
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