Skipping the waiting time after aCGDE and recording CVs directly thereafter (only step B1) for AEs placed at different distances from the PWE are shown in Fig. . For AEs close to the PWE (red curve), in the first negative going scan a large positive current density is observed at high potentials (0.8 -0.95 V RHE ). The current density decreases at more negative potentials until at ca. 0.5 V RHE , the curve follows the CV recorded before aCGDE (black curve). Compared to the CVs presented in Fig. , this large positive current density can at least at high potentials (> 0.95 V) be attributed to the oxidation of H 2 O 2 . Note that the HOR and the ORR are almost suppressed at these potentials, as shown in Fig. and Fig. . The H 2 O 2 oxidation current is also measured at higher potentials (above 0.95 V RHE ) in the following potential cycles, as shown in Fig. . The temporal decrease of the positive current density is more clearly seen in the potentiostatic measurements in Fig. (red curve). The CVs and the potentiostatic experiments indicate that the H 2 O 2 remains in the region around the AE for a certain time until it dissipates into the electrolyte or reacts with the Pt PWE to decompose into O 2 and H 2 O. For AEs located farther from the PWE (blue curve), such a positive current density is not observed in the first negative going or subsequent scans, indicating that H 2 O 2 is not measurably present in the electrolyte far away from the PWE. Similar to the blue curve in Fig. , obtained directly after aCGDE, a large reduction peak is observed at around 0.65 V RHE in the first negative going scan in Fig. (steps B1 and B2). This large peak, which is observed in both experiments, suggests that the electrode surface oxidizes significantly during aCGDE. Interestingly this suggests, that the plasma or the species formed by the plasma only affect the structural properties of the Pt AE, when the AE is placed far away (4.5 cm) from the PWE. For the time being it is not clear if the increase in Pt oxide formation is induced (i) by the plasma (or plasma species) or whether it is related (ii) to changes in electrode potential induced by the electric fields during aCGDE, which could cause an uncontrolled oxidation of the electrode during aCGDE.