Polarization Curves Without Included Ohmic Potential Drop

Polarization Curves Without Included Ohmic Potential Drop... 

The Shape of the Calculated Polarization Curves as Function of lo/iL Ratio Without Included Ohmic Potential Drop... 

The simulated polarization curves which included the ohmic potential drop are shown in Fig. 1.4. They are obtained using the same data as those shown in Fig. 1.3 and for l = 50 mA cm, L = 0.2 cm, and x = 0.1 S cm . In all cases, for jo//l= 100, there is linear dependence of the current density on overpotential up to i = 45 mA cm or to i//L 0.9. In these cases, the overpotential without included ohmic potential drop (see Fig. 1.3) is very low, and the measured overpotential is practically equal to the ohmic potential drop between the working and the reference electrodes. Hence, for /q/Jl > 100, there is the ohmic control of the electrodeposition process. It is obvious that the shape of the linear part of polarization curve does not depend on the mechanism of the electrode reaction. 

The polarization curves without including the ohmic potential drop for different /o/iu ratio values for both, one and two electron reactions, are shown in Fig. 1.3 [21]. They are obtained by using Eq. (1.36) for the different /o/t ratios and/c and/a values obtained for different rj, b, and b in the dependence of the mechanism of electrodeposition reactions. From Fig. 1.3, it is a clear that these dependencies are similar to each other for the large values of the /qAl ratio and at any low value of overpotential. Because of this, the polarization curves without including the ohmic potential drop are not suitable and, for that reason, will be not treated further. 

---