Dear Abeer Farouk Al-Attar
If you are doing the EIS measurement in fuel cell configuration then there is no constraint of cell area. If it is in laboratory scale it can be 5 cm2 or 25 cm2 each (cathode or anode) even very less also.
But if you are doing in half cell means at time cathode side or anode side separately then you have take many more times higher surface area for counter electrode than working electrode.
Regards,
Bapi
Typically there is not constraint for the surface area of the electrodes. The EIS will give a measurement even for an infinitesimally small active area as well (depending upon your potentiostat settings of course).
However, one must take into the account that for a full cell, the lowest surface area of sealing the anode gases from the cathode, would serve as the limiting surface area for your cell
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