Faradaic reactions not governed by electrode collision frequencies

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Summary It is shown theoretically that at least one class of faradaic reactions exists for which formal exchange currents are characterizable and for which no obvious necessity of rate governed by collision frequency with the electrode is obvious. This implies that upper limits to the rate constants for faradaic processes proposed by previous workers need not generally exist. It is suggested that the effect of finite collision frequency should manifest itself in the mass transfer impedance rather than the charge transfer impedance of the faradaic process.