For CTC-65 electrode, more pronounced cathodic peaks related to Cu 2+ /Cu + and Cu + /Cu and anodic peaks related to Cu/Cu + and Cu + /Cu 2+ are positively shifted with an additional peak at -0.74 V vs. Ag/AgCl corresponding to reduction of Sn (Sn 2+ /Sn). The positive shift in the redox peaks of Cu in CTC-65 can be ascribed to the interaction of Cl -ions with the Cu electrode.