Current Density Since i is dependent on area of electrode We normalize currents and examine I=j/A we call this current density So at equilibrium i=0=in H/A=-ICA= IA Which we call the exchange current density Note: by convention ia produces positive currentCurrent Density, I Since i is dependent on area of electrode, we “normalize currents and examine I = i/A we call this current density So at equilibrium, I = 0 = iA + iC  ia /A = -i c /A = IA = -Ic = Io which we call the exchange current density Note: by convention iA produces positive current