Experimental Procedure Since the aCGDE experiments lead to an accumulation of products in the solution, namely H 2 , O 2 and H 2 O 2 , the electrolyte was changed after each experiment to have the same initial conditions for all experiments. To reduce the possible impact of H 2 formed at the plasma counter electrode during aCGDE on the other electrodes (especially the AE), a glass tube was placed around the elec-trode, allowing the majority of the formed H 2 to leave the electrolyte within the perimeter of the glass tube. All measurements were carried out at room temperature. The temperature of the electrolyte before and after the experiment was very similar in each case, with ca. 24 • C measured with a thermometer immersed in the solution. Note that after aCGDE the temperature in the electrolyte is rather inhomogeneous, with higher electrolyte temperatures around the PWE. Since the formation of O 2 during aCGDE is inevitable, the electrolyte was not deaerated before the experiments. All experiments were performed without stirring the electrolyte.