Analytic Expression of the Warburg Impedance for a Rotating Disk Electrode

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Abstract
In the presence of the convective flow pattern of the rotating disk, the classical Warburg impedance is modified, particularly at low frequencies. The transformation of Scherson permits the alternating current impedance problem to be related to the transient flux‐step or concentration‐step behavior of the same system. Here flux‐step results are used to generate low and high frequency analytic expressions which overlap at intermediate frequencies.

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