The catalytic properties of Co0.5Fe0.5O0.5F1.5 were next evaluated through a host of electrochemical techniques. In a standard 3-electrodes configuration, a cyclic voltammogram (CV) of the catalyst deposited onto a carbon paper electrode in 1M KOH electrolyte showed a redox peak centered at 1.1 V vs. the reversible hydrogen electrode (RHE). This peak was attributed to the Co(II/III) redox couple (Fig. and inset). Electrocatalytic current initiated around 1.4 VRHE requires 220 mV overpotential to reach 10 mA/cm 2 and 265 mV to reach 100 mA/cm 2 . On the reverse scan, a reductive peak around 1.4 VRHE was observed and attributed to the reduction of Co(IV) back to Co(III)