SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 94: Poster Session VII: Poster to Mini-Symposium: Electrified solid-liquid interfaces II
O 94.2: Poster
Donnerstag, 4. März 2021, 10:30–12:30, P
Electrooxidation of Isopropanol on Pt and Ru Single Crystals: an An in situ X-Ray Diffraction Study — •Xin Deng1, 2, Ralf Schuster1, Leon Jacobse2, Vedran Vonk2, Yaroslava Lykhach1, Olaf Brummel1, Andreas Stierle2, and Jörg Libuda1 — 1Interface Research and Catalysis, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, D-91058 Erlangen — 2Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, D-22607 Hamburg
By combining isopropanol fuel cells with liquid organic hydrogen carriers, it is possible to convert chemically bound hydrogen into electricity without generation of gaseous gas. Platinum is the best catalyst for alcohol oxidation, however, partial poisoning by the product acetone impacts the activity. The addition of ruthenium increases the reaction rates, however, the origin of the beneficial effect is not clear so far. In this work, we investigated the electrochemical oxidation of isopropanol on Pt(111) and Ru(0001) single crystals by employing high-energy grazing incidence X-ray diffraction. The existence of isopropanol does not influence the oxidation of Pt(111) as the crystal truncation rods (CTRs) show similar shapes in the electrolyte with and without isopropanol. Platinum is severely roughened by potential cycling with an upper potential limit higher than 1.35 V, while Ruthenium is much stable. Further analysing the XRD data of Ru(0001) by fitting the CTRs will help us understand its behavior.