I am trying to determine standard potential/ formal potential (E0') of an irreversible reaction. Could any one please tel me how to do it? In one paper, I found one researcher did it by plotting Ep vs. scan rate. They considered the potential at which scanrate =0, is formal potential. Is it correct?
If so, for NO2- reduction (at a Pt-Cu electrode), E0 = 1.04V ( vs. Ag/AgCl, our result).
From Bard's book exchange current Io = nFAko , which can determined from Tafel equation at zero potential. This means ko is related to zero potential but by definition ko is the rate constant at formal potential (E0')which is may not be zero. So how can I exactly estimate Eo and Ko for an irreversible reaction?
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