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O: Fachverband Oberflächenphysik
O 12: Nanostructures at Surfaces I
O 12.4: Vortrag
Montag, 17. März 2025, 15:45–16:00, H6
Structural, morphological and chemical characterization of plasma-treated NiCoO electrolyzer anodes — •Timo Wagner1, Nicolas Wöhrl1, Vineetha Vinayakumar2, Christian Marcks3, Anna Mechler3, Doris Segets2, and Axel Lorke1 — 1Faculty of Physics and CENIDE, University Duisburg-Essen, Germany — 2IVG-PST and CENIDE, University of Duisburg-Essen — 3AVT.ERT, RWTH Aachen University
Plasma surface pre and post treatment are important steps to tailor characteristics for later manufacturing steps, or as a finishing step to engineer surface characteristics for later applications. We developed a nitrogen microwave plasma process to be used as pre and post treatment for NiCoO coatings for electrolyzers. The plasma treatment resulted in significant modification of the NiCoO films. For example a porous structure, as measured by AFM, SEM and TEM, leads to enhanced accessibility of the active material. Organic species from the spray coating were removed and the plasma-treated NiCoO layers also exhibited a highly hydrophilic surface, which facilitated better interaction with the electrolyte. X-ray absorption spectroscopy (XAS) studies indicated a higher Fe uptake from the electrolyte, which is beneficial for the oxygen evolution reaction (OER). Raman studies showed a more reversible oxidation behavior in the plasma-treated layers. Overall, these modifications contributed to an enhanced OER performance of the NiCoO anodes due to the plasma post-treatment as characterized electrochemically by cyclic voltammetry (CV) and measuring the electrochemically active surface area (ECSA).
Keywords: Plasma; Surface; Microwave; Nitrogen; Nickel