It is related to the pore diameter and the size of the ion which enter in to the pores of the material besides the surface adsorption. Usually the stirring increases the rate of adsorption in to the pores of the material.
it is the electrolyte which enters the pores
compare the pore size and the ion size - pore sizes are very large
even 1nM size pore can accommodate more electrolytes
External resistance refers to diffusional resistance when the ion is in the liquid phase (before entering the pore).
Once it reaches the pore, internal resistance (within the pore/particle) occurs and diffusional mechanism is different than external depending on forces or pore size. Stirring would only decrease external resistance.
External resistance is due to diffusion of ions when it is in the solution phase but when it enters in to the pore there may be repulsion due to same charges which refers to internal resistance
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