Göttingen 2025 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

P: Fachverband Plasmaphysik

P 23: Atmospheric Plasmas and their Applications VI

P 23.6: Vortrag

Donnerstag, 3. April 2025, 17:45–18:00, ZHG006

Influence of Nanosecond Pulsed Plasmas in Liquids on Copper Surfaces — •Pia-Victoria Pottkämper, Sven Weller, Neil Unteregge, Katharina Laake, and Achim von Keudell — Ruhr-Universität Bochum

One application of plasmas in liquids is the modification of metal surfaces. In this project a plasma is ignited at an electrode immersed in liquid using high voltages, nanosecond pulses and fast rise times. The plasma and plasma-activated liquid is then used to modify a coppper surface. The plasma causes a dissociation of water molecules, leading to the creation of many different reactive species with varying lifetimes such as molecular oxygen and hydrogen, solvated electrons and hydrogen peroxyde. These species elicit different reactions that lead to the modification of the copper sample. It is possible to reduce the surface or to initiate growth of nanostructures depending on the experimental conditions. The changes are monitored via FTIR spectroscopy, SEM and cyclic voltammetry. The creation of uniform copper oxide nanocubes has been observed under certain conditions. One application of these structures is the catalysis of the electrochemical reduction of CO2. During this reaction the activity of these catalysts decreases over time. The in-liquid plasma could be used to re-oxidize or create such catalytic surfaces. It is postulated that by combining an in-situ in-liquid plasma treatment with such a catalysis setup the lifetime of the catalytic surfaces can be extended.

Keywords: in-liquid plasma; surface modification; microsecond pulsed plasma