Fig. 7. (A) CV and (B) DPV of the bare ITO (black curve), and pm-CuO/ITO (red curve) electrodes, (C) CV curve of pm-CuO/ITO at varying scan rates (10–100 mV s⁻¹, pH 5.7) at 27 °C. (D) Increasing current vs. difference in potential as a function of the square root of the scan rate (10–100 mV s⁻¹).