A better understanding of the impact of inliquid plasma on an auxiliary target electrode placed in the same electrolyte in proximity to an in-liquid plasma electrode is of interest for the following applications. Firstly, in-liquid plasma could be used to prepare an electrocatalyst in situ. This approach would have the advantage that the electrodes do not have to be trans-ferred after the plasma treatment from a gasphase atmosphere into an electrochemical cell, avoiding contamination or uncontrolled restructuring of the electrode. Furthermore, the electrode potential of the auxiliary electrode can be changed during the preparation process, allowing for more specific tailoring of its structural properties. Secondly, an auxiliary electrode could be used as an electrochemical probe to determine the species formed by the plasma in the electrolyte, to measure the solution pH, or the voltage drop in the electrolyte.