electrodes, respectively, after the electrochemical cleaning process. In the case of the Cu electrode, a noticeable unassigned peak is observed during the reduction cycle, while the Au electrode exhibits the expected behavior of a clean electrode. Figure S2.7. (a) Electrochemical cleaning of Cu electrodes in a 0.1 molar H2SO4 aqueous solution. b and c, Cyclic voltammetry in CO2 saturated anhydrous acetonitrile for Cu (b) and Au (c) electrodes after electrochemical cleaning. 0.5 mol% MM NTf2 was added as supporting electrolyte. a b c
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