Activation Overpotential and Controlling Factors

For a well-mixed solution, that is, when the electrode surface and bulk con-cenfrations are identical, the effects of concentration can be neglected. This implies that the concentrations of reactant and product species at the electrode are not affected by the net reaction rate. In this case, the BV equation simplifies to 

The effect of exchange current density on the current density and overpotential relation. 

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