Question

What is imaginary part in nynquist plot for impedance analysis?

Answer 1

The imaginary component of theimpedance provides a measure of the reactive part of the impedance (e.g. capacitance). Impedance is the vector sum of the capacitance ( imaginary ) and the resistance (real) of the circuit in question. This can be better resolved from the Nyquist plot.

Answer 2

Here is your answer

At temperature higher than 0K it is not possible to transfer electrical charge through material without losses, which measure is a material resistance. In case of AC it is called impedance. You can look on it from both sides. The impedance is a nice tool to measure all reasons in one go (and like capacitance, inductance got different physical meaning, but the impact on charge transfer is the same-  slow down). Or go opposite and using measured impedance split it in a parameters, finding out teh impact of specific parameter. It was developed for studying processes on interfaces. It works well, if there are few distinct parameters dominating. For example, if the electrodes are immersed in a liquid electrolyte and charge transfer is limited by diffusion of charge carrier species, Warburg behavior is observed adn diffusion coefficients migt be measured. If no limiting process takes place and different processes are mixed most likely the method will be of no use to investigate those processes, just electrical resistance in general. The use of complicated equivalent circuits can not solve the problem, because the circuit is just a mathematcial model without adding any extra parameters for calculation. The method depends on a number of time domains on a real measurement.Few simple answers. Parasitic effects. The cell set-up. How the contact on interface electrode/eelctrolyte is arranged. Typically, the pressure is changing etc and interface capacitance is changing. Inductance effects might mean the electrode corrosion (interaction with electrolyte), protonic electrolytes are acidic and corrosive sometimes. In order to establish a better contact, the pressure is increased and it will nicely facilitate the solid state reaction. 

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