I was measuring the bulk resistance of a gel polymer electrolyte using electrochemical impedance spectroscopy. As shown in the Nyquist plot obtained at room temperature, supposingly the width of the semicircle implies the bulk resistance of the electrolyte. However, at 80 degree celsius, the simicircle disappeared, and the data points seem to be scattering in a weird pattern... May I know how should the bulk resistance be calculated in the plot at 80 degree celsius, and is there any explanations for this observation? Thank you!
Dear Austin Yuhang Yap ,
welcome!
The heating of the electrolyte decreases its mobility. So, it is expected that the bulk resistance increases. The dielectric consatnt may also decrease such that the shunting capacitor decreases. This means that the semicircle may enlarge with temperature.
In order to predict the tendency of the change of the bulk impedance with temperature I would propose that you measure at intermediate temperatures and observe how the plot changes.
Best wishes
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