In step B2, the plasma was turned off and the AE potential was kept for 15 min at 1.0 V RHE (Fig. ). When the AE is located far away from the PWE, the current density (blue curve) recorded at the AE is almost zero and remains constant for the rest of the waiting period. In the case where the AE is located close to the PWE the current density (red curve) is high when the plasma is turned off. With time, the current density decreases and remains constant at slightly positive current densities during the entire waiting time. For comparison, keeping an AE at 1.0 V RHE for 15 min without exposing it to aCGDE (no step B1 -green curve in Fig. ), the current density is almost zero. This difference in current densities recorded at the AE placed at different distances from the PWE, demonstrates that aCGDE certainly has Steps A, B2, and C are performed without aCGDE. In step B1, simultaneously aCGDE was performed at 580 V for 30 s. The red and blue curves show the measurements for AEs placed at a distance of 1.5 cm or 4.5 cm from the PWE, respectively. For comparison, the green curve shows the case where the AE was not exposed to aCGDE (no step B1). an impact on the current time profiles recorded at auxiliary electrodes.