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A concentration gradient of ox caused by its depletion at the electrode surface leads to mass transport by diffusion. This leads to a flux of ox, Jox (mol/m2s) that related to the reduction current, ired, through the electrode with an area A according to Faraday’s law:
ired = - nFAJox ↔ ↔ Jox = - ired / nFA
The electrical current is proportional to the amount of DO transported by the electrode.
Fick's law of diffusion: ......
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