SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Poster: Supported Nanoclusters
O 41.4: Poster
Dienstag, 28. März 2023, 18:00–20:00, P2/EG
Influence of Strong Metal-Support Interactions on the Photoactivity of Pt-loaded TiO2(110) — •Lucia Mengel, Philip Petzoldt, Moritz Eder, Martin Tschurl, and Ueli Heiz — Chair of Physical Chemistry, School of Natural Sciences & Cataly- sis Research Center, Technische Universität München, Lichtenbergstr. 4, 85748 Garching, Germany
Pt-loaded TiO2(110) is well-known for its capability of alcohol photoreforming. The hole-mediated photooxidation reaction yields hydrogen next to valuable organic compounds such as formaldehyde. The concept of encapsulation of clusters or nanoparticles by a metal oxide overlayer under reductive conditions is well established and has been extensively studied using a variety of techniques. Such encapsulations caused by strong metal-support interactions (SMSI) are a promising tool in photo-/electrocatalysis to improve catalyst selectivity and high-temperature stability. However, there is a lack of mechanistic understanding on the influence of an SMSI overlayer on the photocatalytic hydrogen evolution reaction.
In this poster, we discuss the influence of SMSI on the photoactivity of Pt-loaded TiO2(110). As model reaction, methanol photoreforming is studied by catalytic measurements. We focus in particular on effects with relevance to the evolution of hydrogen, as TiOx layers may impede the back reaction in full water splitting and thus have potential to replace currently predominant chromium oxide compounds.