Electrochemical behaviour of copper in N,N-dimethylformamide plus 0.5 M potassium perchlorate solution

The electrochemical deposition and dissolution of copper in 0.0025 M CuSO4+ N,N-dimethylformamide + 0.5 M KClO4 solution was examined by the rotating disc and potentiodynamic methods. Both platinum and copper were used as working electrodes. A wide polarization range -1 to +2 V vs. SCE, and several temperatures between 25 and 55 degrees C were encompased. The Cu/electrolyte interface was found to he permanently out of equilibrium, as a consequence of the development of a passivating layer. Tn accordance with the classic theory of a copper electrode in acidified aqueous solutions, the cathodic and anodic Tafel lines of metallic copper define a unique value of the exchange current density, however, their slopes do not correspond to the classic theory.