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For
most real situations, both activation and concentration considerations
will control the current as a function of the applied over-potential at
which the reduction reaction is taking place.
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The
diagram shows the development of the current, starting at zero overpotential
and the the exchange current i0,
then increasing with a slope, β,
in the range controlled by activation energy considerations, and finally
saturating at the limiting value, iL,
determined by the diffusion controlled transport rate. |
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