Channel Electrodes and Current Distribution

The Levich equation for the transport-limited current at a channel electrode predicts 

Suppose that the diffusive flux, j(0), varies with x, the distance downstream from the upstream edge of the electrode, as follows  

Thus the current density (flux) is predicted to be infinite at the upstream edge of the electrode. In reahty, this would not be attained, since finite electrode kinetics preclude the passage of an infinite current. Nevertheless, the flux would be very large at x = 0. 

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