An experimental study has been made of the polarization characteristics of the following oxidation‐reduction electrode systems: iron sulfate, iron chloride, potassium ferrocyanide‐ferricyanide, and cerium sulfate. Data are presented which strongly indicate that the overvoltage includes an activation overvoltage in addition to that due to concentration polarization. The data are analyzed from the point of view of rate processes and it is shown that the electrode behavior is given by an equation which allows an evaluation of the exchange current density and the transfer coefficients.
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