Abstract
Microfluidic devices in general and channel electrodes in particular offer a wide variety of opportunities for analytical electrochemistry, especially as an easily manufactured rotating disk analog. In terms of this, electrochemical impedance spectroscopy as a method is a quickly recorded method that allows for fast characterization of the system. However, channel electrodes are not uniformly accessible, which greatly complicates the numerical treatment of the mass-transport to these electrodes. Using a reversible hexaammineruthenium(II/III) redox couple, the mass-transport impedance was measured, shown in Fig. 1a, and modelled using commercially available numerical software (Comsol Multiphysics ®). The results using numerical modelling were discussed in terms of common assumptions and used as a benchmark to test the validity of these approximations [1]. In addition, a new method using galvanostatic impedance spectroscopy at the upstream electrode and detecting the frequency dependent potential at a downstream electrode was discussed, Fig. 1b. Potentially, this allows for quick acquisition of geometric, kinetic and mass-transport parameters to allow quick characterization of a double channel electrode setup. [1] T. Holm, M. Ingdal, E.V. Fanavoll, S. Sunde, F. Seland, D.A. Harrington, Electrochimica Acta 202 (2016) p. 84. Figure 1
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