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P: Fachverband Plasmaphysik

P 10: Poster Session I

P 10.4: Poster

Dienstag, 1. April 2025, 16:15–18:15, ZHG Foyer 1. OG

Elechtrochemical investigation of microsecond plasma-in-liquid treated copper surfaces — •Neil Dominik Unteregge, Pia Victoria Pottkämper, and Achim von Keudell — Ruhr-Universität Bochum, Bochum, Deutschland

The aim of this project is to investigate the production of hydrogen peroxide and its effects on copper oxide surfaces. This interaction leads to the growth of copper oxide nanocrystals, which are valuable catalysts for the electrochemical reduction of CO2. However, the catalysts activity decreases during operation in an electrochemical cell. In this project an in-liquid plasma is ignited in distilled water, which creates many reactive species with varying lifetimes, such as hydrogen peroxide, molecular oxygen and hydrogen, as well as solvated electrons. This plasma is powered using high voltages and microsecond pulses. The energy dissipated in each pulse triggers the phase transition to water vapor and allows dissociation in the plasma state. As a result, so-called plasma activated water (PAW) is obtained. The concentration of hydrogen peroxide in PAW is determined by absorption spectroscopy using the reaction of hydrogen peroxide with ammonium vanadate as sensor. PAW is then brought into contact with the copper oxide surfaces to induce the nanocrystal growth. The copper oxide surfaces are analyzed by SEM and cyclic voltammetry.

Keywords: hydrogen peroxide; plasma in liquid; microsecond pulse; copper oxide; cyclovoltammetry