These paths are all defined through their first step directly following OOH*, i.e. one of the four competing steps illustrated in Fig. . The final (three) states on the right of Scheme 1 are those which are typically considered within the limiting potential analysis. These states can all form from OOH* upon re-arranging the chemical bonds and adding a (H + + e -) pair; the chemical potential of which is simply accounted for via the CHE on top of the intermediates' free energy difference when evaluating the reaction thermodynamics.