SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 29: Supported Nanoclusters: Structure, Reactions and Catalysis
O 29.10: Vortrag
Dienstag, 28. März 2023, 12:45–13:00, CHE 91
Changing surface morphology and chemistry by scalable atmospheric pressure plasma treatment — •Timo Wagner1, Nicolas Wöhrl1, Vineetha Vinayakumar2, Doris Segets2, and Axel Lorke1 — 1Faculty of Physics and CENIDE, University Duisburg-Essen, Germany — 2Particle Science and Technology (IVG-PST) and CENIDE, University of Duisburg-Essen
Nickel foams provide a large specific surface area. Yet, compared to bulk nickel plates, they are less desirable for industrial applications due to their higher cost and more difficult handling. As part of H2Giga, the hydrogen flagship project by the German Federal Ministry of Education and Research (BMBF), we developed a plasma treatment for industry relevant nickel plates and catalyst particles. In a common manufacturing process for electrolyzers, nickel plates or meshes are first coated with a suspension of catalyst particles. Afterwards the solvents get thermally evaporated, yielding the finished electrode. With our process, the blank nickel surface can be roughened up by exposing it to a nitrogen plasma as a form of pre treatment. Also after coating, an exposure to a nitrogen plasma shows significant morphological changes. The individual particles coalesce to bulbs, that are again interspersed by a sponge-like porous structure. these structures have shown to notably improve the electrochemical performance of the electrodes, decreasing the overpotential by ca. 100mV.