Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 6: Water on Surfaces
O 6.4: Vortrag
Montag, 1. April 2019, 11:30–11:45, H16
Nickel doping enhances the reactivity of Fe3O4(001) to water — •Zdenek Jakub, Jan Hulva, Francesca Mirabella, Florian Kraushofer, Matthias Müllner, Michael Schmid, Ulrike Diebold, and Gareth S. Parkinson — Institute of Applied Physics, TU Wien, Austria
Spinel ferrites are technologically important materials showing high catalytic activity for oxygen evolution and water gas shift reactions. In our previous work we’ve described water adsorption on Fe3O4(001), which is also a well-documented model surface for single-atom reactivity studies. In this work we focus on the water adsorption on nickel-enriched Fe3O4(001) surface. Using scanning tunneling microscopy, temperature programmed desorption and x-ray phototemission spectroscopy we show nickel adatoms activate the surface for water dissociation and adsorption above room temperature. At the same time, the presence of nickel adatoms on the surface blocks the formation of partially-dissociated water dimers and trimers which are observed on the clean surface. Interestingly, this result does not change when the adatoms get incorporated into the surface by thermal annealing.