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CVs measured with an SPE modified with 0.1% Nafion (a), 0.5% Nafion (b), and 1% Nafion (c) in an aqueous solution containing 1 mM K3Fe(CN)6-K4Fe(CN)6 (1:1) and 0.1 M KCl as the supporting electrolyte at a scan rate of 50 mV/s. I/A, current in amperes; E/V, electrode potential in volts.
