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Electrochemical impedance spectroscopy measurements (three colors; three replicates) of differently treated electrodes in the solution of 10 mM K3[Fe(CN)6] and 0.1 M KCl. (a) Pristine electrode; (b) negative-plasma-treated electrode; (c) positive-plasma-treated electrode; (d) H2O2-treated electrode; (e) H2SO4-treated electrode.
