Fig. 2.

Current functional plot of i_pa and i_pc for FcA and FcMeOH; peak currents obtained from cyclic voltammograms recorded from solutions of FcMeOH-oxygenated ◆, FcMeOH-deoxygenated (+), non-electrocatalytic FcA-oxygenated (Fig. 1 O2) ▲, FcA-oxygenated O₂ electrocatalytic peak ⁎ (Fig. 1 O3), difference between peak currents obtained for FcMeOH-oxygenated and FcMeOH-deoxygenated which termed the electrocatalytic O₂ peak ● <20 mV s⁻¹). Insets represent current values at lower scan rates.