Journal
SCIENCE
Volume 336, Issue 6083, Pages 889-893Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1219468
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Funding
- Danish Research Agency
- Strategic Research Council
- Villum Kahn Rasmussen Foundation
- Carlsberg Foundation
- Lundbeck Foundation
- Haldor Topsoe A/S
- European Research Council
- U.S. Department of Energy, Basic Energy Sciences, Chemical Sciences Office
- NSF
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The diffusion of hydrogen atoms across solid oxide surfaces is often assumed to be accelerated by the presence of water molecules. Here we present a high-resolution, high-speed scanning tunneling microscopy (STM) study of the diffusion of H atoms on an FeO thin film. STM movies directly reveal a water-mediated hydrogen diffusion mechanism on the oxide surface at temperatures between 100 and 300 kelvin. Density functional theory calculations and isotope-exchange experiments confirm the STM observations, and a proton-transfer mechanism that proceeds via an H3O+-like transition state is revealed. This mechanism differs from that observed previously for rutile TiO2(110), where water dissociation is a key step in proton diffusion.
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