Surface Reduction State Determines Stabilization and Incorporation of Rh on α‐Fe 2 O 3 (11¯02)
| Autor: | Moritz Eder, Michael Schmid, Gareth S. Parkinson, Zdenek Jakub, Giada Franceschi, Ulrike Diebold, Ali Rafsanjani-Abbasi, Michele Riva, Florian Kraushofer, Matthias Meier, Nikolaus Resch, Sarah Tobisch |
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| Rok vydání: | 2021 |
| Předmět: |
Condensed Matter - Materials Science
Materials science Mechanical Engineering 02 engineering and technology Hematite 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences ddc 0104 chemical sciences Catalysis Crystallography Adsorption Low-energy ion scattering Mechanics of Materials visual_art Atom visual_art.visual_art_medium Density functional theory Surface layer 0210 nano-technology Stoichiometry |
| Zdroj: | Advanced Materials Interfaces |
| ISSN: | 2196-7350 |
| DOI: | 10.1002/admi.202001908 |
| Popis: | Iron oxides (FeOx) are among the most common support materials utilized in single atom catalysis. The support is nominally Fe2O3, but strongly reductive treatments are usually applied to activate the as-synthesized catalyst prior to use. Here, we study Rh adsorption and incorporation on the (1-102) surface of hematite ({\alpha}-Fe2O3), which switches from a stoichiometric (1x1) termination to a reduced (2x1) reconstruction in reducing conditions. Rh atoms form clusters at room temperature on both surface terminations, but Rh atoms incorporate into the support lattice as isolated atoms upon annealing above 400 {\deg}C. Under mildly oxidizing conditions, the incorporation process is so strongly favoured that even large Rh clusters containing hundreds of atoms dissolve into the surface. Based on a combination of low energy ion scattering and scanning tunnelling microscopy data, as well as density functional theory, we conclude that the Rh atoms are stabilized in the immediate subsurface, rather than the surface layer. |
| Databáze: | OpenAIRE |
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