Each column in Fig. represents one of the experimental steps above. The time axis always counts from the beginning of each of these steps. The variation of the current density for an AE located 1.5 cm from the PWE (close to the PWE) is shown as a red curve and that for a distance of 4.5 cm as a blue curve (far from the PWE). The green curve represents the case where the AE was not exposed to aCGDE (no step B1), and was kept for 15 min at 1.0 V (in step B2). The same color scheme is used throughout the article. After aCGDE, a waiting period of 15 min was applied to ensure that the species formed by the plasma have sufficient time to distribute evenly in the electrolyte.