eV, for structures 1 and 2, respectively) for both model catalysts without any applied potentials (i.e., at We next took to further elucidating the mechanism of the OER on Co0.5Fe0.5O0.5F1.5 catalyst surfaces through pH-dependent electrochemical experiments. CVs of the catalyst were recorded from pH 11 to nominally pH 14 (Fig. ). At pH 11, the current attributed to Co redox peaks was considerably lower until approximately pH 12, whereas the reduction of Co(IV) increased continually until pH 14. Only at pH 14, the same amount of charge was integrated under the Co(IV) reduction as the Co(III) reduction (Fig. ). In addition to the rise in Co(IV), the catalytic current also increased more rapidly at higher pH electrolytes, quantified here by a decrease in Tafel slope (Fig. ). Finally, the absolute potential (here plotted on vs. the Standard Hydrogen Electrode, SHE) of the Co redox potentials and the catalytic current exhibited differing shifts as a function of electrolyte pH (Fig. ).