The porous nature of the material should show up in the impedance behaviour in terms of inductance element. I do not see any value given for the inductance at the interface in these plots which are obtained for some porous carbon materials for super capacitor applications.
Sandhya Rani Hi, as i understand the porosity of electrodes is not represented by Inductance, rather the Warburg diffusion indicates the porosity. You may note a small semi-circle in the low-frequency region, that diffusion shows that there are some electrolyte ions inside the pores, thus confirming the presence of pores.
Another point to be noted in EIS for supercap application is the behavior at high frequency region. Ideal EDLC shows a straight vertical line. In your figures, we can see a slanted line, this shows the "capacitive nature" of your electrodes.
Hope it helps.
the porous nature can also be referred to lower height of the first semi-circle. separate cirle is more clear if you are using dummy cell set-up. in the case of asymmetric supercapacitors the height of the curve is changed dominantly. we discussed this effect in our recent work.
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