Correlation Between Specific Surface and Overpotential of Electrodeposition

1 Correlation Between Specific Surface and Overpotential of Electrodeposition 

The specific surface of a powder and a powdered deposit is determined as the surface per unit of the mass of powder. 

The last effect can be qualitatively discussed as follows. In the Eq. (1.31), the activation part of electrodeposition overpotential required for the charge transfer, /act. is given by Eq. (2.89), while the rest of the overpotential is due to mass transfer limitations, given by Eq. (6.1)  

It is obvious that a very small increase of current density in the limiting diffusion current density range causes a large increase in deposition overpotential. Hence, the charge transfer overpotential and the ohmic drop in the solution remain the same for all overpotentials belonging to the limiting diffusion current density plateau. 

The energy of disperse solid copper surface formation, /s, calculated by Eq. (6.5) includes all energetic loses during electrodeposition in the range of the limiting diffusion current densities. 

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