Figure 3.

Representative cyclic voltammograms as a function of scan rate obtained with active redox cycling (solid curves for negative current at the generator and positive current at the collector electrodes) and without active redox cycling (dashed curves for generator only; collectors off) in the open (left panels) and closed (right panels) microchannel, using the internal electrode set-up. Seven generator electrodes were shorted together; seven collectors were shorted together and either left at open circuit (no active redox cycling) or held at −0.1 V (active redox cycling). The solution consisted of 0.4 mM K₄Fe(CN)₆ in 0.1 M KCl.