Differential capacitance was determined via chronoamperometry (CA) by measuring in 20 mV steps towards the respective reductive or oxidative direction. At each of these steps, which were applied to both working electrodes simultaneously, the current was detected over 5 seconds and the amount of flowed charge was determined via integration. The capacitive current was extracted from the total measured current by background correction (assuming the Faraday current exhibits Cottrell behavior). At the end of such a 20 mV step, the final potential was held and the steady-state conductivity was measured by means of Cyclic Voltammetry (CV). The potential of first WE was held constant while the potential of the second WE was scanned ±10 mV around this constant potential. In case a conductive channel is present between both WE, the current detected on both working electrode channels have the same magnitude, but different signs. The steady-state conductivity was calculated from the slopes of the iV-curves.