Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 18: Focus Session: Frontiers in Reducible Oxide Surface Science II
O 18.1: Invited Talk
Monday, March 12, 2018, 15:00–15:30, HE 101
Surface chemistry of ruthenates — •Ulrike Diebold1, Daniel Halwidl1, Wernfried Mayer-Schmözer1, 2, Martin Setvin1, Florian Mittendorfer1, 2, Josef Redinger1, 2, and Michael Schmid1 — 1Institute of Applied Physics, TU Wien, Vienna, Austria — 2Center for Computational Materials Science, TU Wien, Vienna, Austria
Ternary oxides with a perovskite-type crystal structure are of increasing interest in energy-related applications such as solid oxide fuel/electrolysis cells and (photo-) electrocatalysis. Surface science studies can provide an atomic-scale understanding of relevant fundamental processes, but appropriate model systems with a well-defined surface structure are rare. Here we report our results on the cleaved CaO and SrO-terminated surfaces of the Ruddlesden-Popper materials Ca3Ru2O7 and Sr3Ru2O7. Surfaces can easily be prepared by exfoliation in UHV, which provides large, defect-free terraces that are ideal for atomic-scale investigations. We used STM and nc-AFM in combination with XPS and DFT to investigate the adsorption of H2O [1,2] and O2. We find that results on the related binary oxides give a good first guide for the adsorption behaviour, and that the tilting and rotation of the materials’ octahedra strongly influence the ordering of overlayers. [1] D. Halwidl, et al. Nature Mater. 15 (2016) 450. [2] D. Halwidl, et al., Nature Comm. 8 (2017) 23.