An activation-controlled large-overpotential relation . The Tafel slope uses volts per decade when the logarithm is base ten. Exchange current density and operating current density must use the same area convention.
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The Tafel equation is an important relationship in the field of electrochemistry that expresses the relationship between the overpotential ( η) and the current density (j) in an electrochemical reaction. It is particularly useful for understanding the kinetics of electrode reactions, especially in cases where the reaction is limited by the rate of charge transfer.