Electrochemical Cell In order to study the influence of the PWE on the AE, all electrodes were placed in the same electrochemical cell. The latter consists of a large glass beaker (diameter: 13.5 cm, height: 7.5 cm) containing 650 mL of 0.01 M KOH, where a glass tube was placed around the plasma counter electrode (illustrated in Fig. ). In the case where no glass tube was employed (as in the measurements shown in Fig. ) the beaker was only filled with 500 mL electrolyte.