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O: Fachverband Oberflächenphysik
O 94: Oxides and insulators: Adsorption and reaction of small molecules
O 94.4: Vortrag
Freitag, 13. März 2026, 10:30–10:45, HSZ/0204
Redox dynamics of Co3O4(111) during H2S adsorption and decomposition — Jonas Hauner1, Tomáš Skála2, Nataliya Tsud2, Fernando Stavale3, •Yaroslava Lykhach1, and Jörg Libuda1 — 1Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany — 2Charles University, Prague, Czech Republic — 3Brazilian Center for Research in Physics, Rio de Janeiro, Brazil
The redox interactions between transition metal oxides and sulfur-containing compounds play a key role in catalytic processes and gas sensing technologies. We investigated the redox dynamics of Co3O4(111)/Ir(100) model catalysts in response to the adsorption and decomposition of hydrogen sulfide (H2S) using synchrotron radiation photoelectron spectroscopy (SRPES). Upon adsorption, H2S partially dissociates to form a variety of species including sulfites, sulfides, chemisorbed H2S, hydroxyl and sulfhydryl groups. Subsequent annealing in ultrahigh vacuum induces desorption and conversion of adsorbed species to sulfates. These transformations are accompanied by temperature-dependent redox processes which can be monitored as a function of Co3+/Co2+ ratio. The obtained insights into H2S–Co3O4 redox interactions offers a foundation for the rational design of cobalt oxide catalysts and sensors for H2S detection and abatement.
Keywords: hydrogen sulfide; cobalt oxide; redox processes; adsorption; synchrotron radiation photoelectron spectroscopy