We equilibrated the CFM at 60Hz and 10 Hz for 10 min each respectively with the applied waveform before the measurement. We performed FSCV in a beaker containing 0.1 M KCl with a stir bar rotating at 350 RPM. We added the analyte to the beaker at approximately 4 s after beginning data acquisition, with a total acquisition time of 30 s for each FSCV data file. For analysis, we exported all plots (the current vs. time curves and cyclic voltammograms) and converted the ordinate to current densities by dividing the current obtained by the geometric surface area. We performed linear regression using GraphPad Prism 9 on the current density vs. time plot for each measurement. The y-intercept of this regression line obtained was used as the average current density for that experimental condition.