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O: Fachverband Oberflächenphysik

O 32: Poster: Solid-Liquid Interfaces

O 32.9: Poster

Dienstag, 19. März 2024, 18:00–20:00, Poster C

CGDE-modified Ni expanded metals as HER and OER catalysts under close to industrial conditions — •Justus Leist, Lukas Forschner, Timo Jacob, and Albert K. Engstfeld — Ulm University, Institute of Electrochemistry, Ulm, Germany

Applying a sufficiently high voltage to a gas-evolving electrode in an aqueous electrolyte can lead to the formation of a water vapor sheath around the electrode, in which a plasma can be ignited. With this so-called Contact Glow Discharge Electrolysis (CGDE), it is possible to modify the surface structure of an electrode. [1] This in turn can be used to tune the catalytic activity of an electrode, as shown recently for the oxygen evolution reaction (OER) on CGDE modified Ni foams.[2]

In this work, we show the effect of CGDE treated Ni expanded metals on the hydrogen and oxygen evolution reaction. These kinds of electrodes are less prone to bubble inclusion compared to foams. The structural properties of the electrodes are studied by scanning electron microscopy (SEM) and electrochemical methods, such as cyclic voltammetry (CV). The catalytic activity for the OER and HER is investigated using alkaline flow electrolysis cells to mimic industrial operating conditions at different temperatures. The observed trends in reactivity are discussed with respect to the structural changes obtained due to the CGDE and their relationship with oxidation states before and the temperature during HER and OER.

[1] Artmann et al. ChemPhysChem 22 (2021) 242. [2] Hausmann et al. Advanced Energy Materials 12 (2022) 38.

Keywords: Plasma; CGDE; Nickel; HER; OER