To explore the electrochemical properties of the Cu2O and CTC-65 electrodes, cyclic voltammetry was employed in a three-electrode system (Figures and). The cyclic voltammograms of Cu2O and CTC-65 was recorded in 1 M KOH electrolyte in the potential range from -2.5 V to +1.0 V (vs. Ag/AgCl) with a scan rate of 50 mV s -1 . From figure , the Cu2O shows two reduction peaks with cathodic peak potential (Epc) values of -0.45 and -0.98 V vs. Ag/AgCl, which can be assigned to the reduction of Cu 2+ /Cu + and Cu + /Cu, respectively. During the reverse scan, two oxidation peaks of -0.36 and -0.05 V vs. Ag/AgCl were observed. The first anodic peak (Epa -0.37 V) is associated with the oxidation peak of Cu/Cu + while the second peak (-0.05 V) is associated with the Cu + /Cu 2+ .