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O: Fachverband Oberflächenphysik
O 92: Oxide and Insulator Surfaces II: Structure, Epitaxy and Growth
O 92.7: Vortrag
Freitag, 31. März 2023, 12:00–12:15, CHE 91
Role of orientation and oxyhydroxide formation on the OER activity of LaNiO3 surfaces — •Achim Füngerlings1, Marcus Wohlgemuth2, Marcel Risch3, Felix Gunkel2, Christoph Bäumer2,4, and Rossitza Pentcheva1 — 1Department of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Duisburg, Germany — 2Peter Gruenberg Institute and JARA-FIT, Forschungszentrum JuelichGmbH, Juelich, Germany — 3Nachwuchsgruppe Gestaltung des Sauerstoffentwicklungsmechanismus, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin, Germany — 4MESA+ Institute for Nanotechnology, Faculty of Science and Technology,University of Twente, Enschede, Netherlands
We present a combined experimental and theoretical study of the influence of surface orientation and transformation on the OER activity of Ni-terminated (001), (110) and (111) oriented LaNiO3 films, epitaxially grown on SrTiO3 substrates via pulsed laser deposition and characterized by AFM and XRD, as well as Hall measurements of the electrical conductivity. Cyclic voltammetry shows the lowest overpotential for (111) and the highest for (001), and gives indication for the formation of a surface oxyhydroxide(-like) skin layer, supported by EXAFS measurements. Based on density functional theory calculations with an on site Hubbard U, we explored different models for the transformed surfaces and find a strong sensitivity of the OER activity on interlayer H concentration and number of oxyhydroxide layers with distinct behavior of the two surface orientations.