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SECM images (x-y scans) of the (A) bare GCE surface, (B) poly(Met)/GCE surface and (C) Co-poly(Met)/GCE surface. SECM imaging was performed with a 10 mm-width Pt microelectrode in 1.0 mmol/L [Fe(CN)6]3− solution as a redox mediator containing 0.1 mol/L KCl as a supporting electrolyte.
