Channel Electrodes and Limiting Currents

Calculate the transport-limited current for the one-electron oxidation of a 1 mM aqueous solution of ferrocyanide, Fe(CN)g , at a macro-channel electrode of size 4.0 mm X 4.0 mm in a flow cell of cross-section dimensions 6 mm x 0.4 mm at flow rates (Vf) of 10 and 10 cm s . Assume a value of 6x10 cm s for the diffusion coefficient of ferrocyanide. 

The transport-limited current for a one-electron oxidation process at a channel electrode is given by 

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