Journal
NATURE COMMUNICATIONS
Volume 9, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-018-05685-5
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Funding
- Austrian Science Fund FWF (SFB Functional Oxide Surfaces and Interfaces - FOXSI) [F 45]
- ERC Advanced Grant OxideSurfaces [ERC-2011-ADG_20110209]
- NSF CAREER Award of the National Science Foundation, Division of Materials Research, Ceramics Program [1055583]
- FWF-SFB project ViCoM [F41]
- National Natural Science Foundation of China [21303156, 21543006]
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Perovskite oxide surfaces catalyze oxygen exchange reactions that are crucial for fuel cells, electrolyzers, and thermochemical fuel synthesis. Here, by bridging the gap between surface analysis with atomic resolution and oxygen exchange kinetics measurements, we demonstrate how the exact surface atomic structure can determine the reactivity for oxygen exchange reactions on a model perovskite oxide. Two precisely controlled surface reconstructions with (4 x 1) and (2 x 5) symmetry on 0.5 wt.% Nb-doped SrTiO3(110) were subjected to isotopically labeled oxygen exchange at 450 degrees C. The oxygen incorporation rate is three times higher on the (4 x 1) surface phase compared to the (2 x 5). Common models of surface reactivity based on the availability of oxygen vacancies or on the ease of electron transfer cannot account for this difference. We propose a structure-driven oxygen exchange mechanism, relying on the flexibility of the surface coordination polyhedra that transform upon dissociation of oxygen molecules.
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