Voltammetric studies were performed using a Biologics Dual Channel SP300 Potentiostat, equipped with a low current amplifier. The SECM measurements were performed using a homebuilt bipotentiostat comprised of a Dagan Chem-Clamp with a preamplifier head-stage (Dagan Corporation, U.S.A). University of Warwick electrochemical scanning probe microscopy software was used to record current-time and current-distance curves. Acquired data were processed with OriginPro 2022 software.