The Nyquist plot obtained from the EIS spectroscopy shows the the mass transfer controlled region in the low frequency regime, which is observed as a non-vertical line in the plot. Please explain why this happens at the low frequency region.
Gustav Karl Henrik Wiberg
Firstly, in order for an element to be measured with EIS, it has to be the limiting factor, ie. have a larger impedance than anything else.
Secondly, you can see the frequency as a rate for a certain process is taking place. Diffusion, which the Warburg element is trying to model is a relative slow process and the impedance becomes domianting at low frequencies. Similarly, a capacitance is dominanting at low frequence because the impedance from it becomes large at low frequence.
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