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O: Fachverband Oberflächenphysik
O 65: Solid-Liquid Interfaces: Reactions and Electrochemistry III
O 65.3: Vortrag
Mittwoch, 19. März 2025, 15:30–15:45, H6
The relationship between composition, structure and activity of well-defined Pt-Ru alloys during electroreduction of acetone — •Robert Hübsch1, Pankaj Kumar Samal2, Frederike Jäschke1, Tomáš Skála2, Nataliya Tsud2, Josef Mysliveček2, Olaf Brummel1, Yaroslava Lykhach1, and Jörg Libuda1 — 1Interface Research and Catalysis, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany — 2Department of Surface and Plasma Science, Charles University, Prague, Czech Republic
The isopropanol/acetone couple can be used as an electrochemically active liquid organic hydrogen carrier (EC-LOHC). PtRu-based alloys are the state-of-the-art catalysts for the electrooxidation of isopropanol. We have investigated the reverse reaction, i.e. electrochemical reduction of acetone, on well-defined PtxRu1-x alloys by means of cyclic voltammetry (CV), synchrotron radiation photoelectron spectroscopy (SRPES) coupled with an ex-situ emersion electrochemical cell, electrochemical infrared reflection absorption spectroscopy (EC-IRRAS), and differential electrochemical mass spectrometry (DEMS). In a systematic study, we established structure-activity relationships for well-ordered PtxRu1-x alloys and surfaces subjected to dealloying in pure and acetone-containing electrolyte. We found that the active state of the catalyst corresponds to the presence of ultra-small Pt aggregates supported on partially oxidized Ru(0001). While Pt(110) forms propane as reduction product, the dealloyed catalysts form the target product isopropanol and suppress propane formation.
Keywords: Pt-Ru Alloys; Acetone Reduction; SRPES/XPS; DEMS; EC-IRRAS