Fig. 1. Cyclic voltammogram of a 100 μm diameter Cu electrode (tip, red line) positioned 30 μm above the ITO electrode (substrate) polarized at −0.5 V. The blue line is the substrate current vs. tip potential. Electrolyte: 1 M KCl + 10 mM HCl; scan rate: 50 mV s−1. The inset is a general scheme of localized electrorefining of Cu with SECM (not to scale).
