Elimination of diffusion overpotential with a rotating disc electrode

1 Elimination of diffusion overpotential with a rotating disc electrode [Pg.188]

The contribution of diffusion overpotential to the total overpotential can be achieved by an increase of convection near the electrode surface. In a very controlled manner this is possible with the rotating disc electrode. In the Koutecky—Levich equation the separation of diffusion contributions and charge transfer contributions to the overpotential was achieved. A general charge transfer reaction with exchange of n electrons was chosen. The Koutecky-Levich equation is [Pg.188]

D is the mean diffusion coefficient of and v kinematic viscosity (see Section 5.3.1), and co = 2nf the angular velocity with/the rotation frequency. In the anodic Tafel region the following equation is obtained [Pg.188]