Publication detail

Rapid oxygen exchange between hematite and water vapor

JAKUB, Z. MEIER, M. KRAUSHOFER, F. BALAJKA, J. PAVELEC, J. SCHMID, M. FRANCHINI, C. DIEBOLD, U. PARKINSON, G.

Original Title

Rapid oxygen exchange between hematite and water vapor

Type

journal article in Web of Science

Language

English

Original Abstract

Oxygen exchange at oxide/liquid and oxide/gas interfaces is important in technology and environmental studies, as it is closely linked to both catalytic activity and material degradation. The atomic-scale details are mostly unknown, however, and are often ascribed to poorly defined defects in the crystal lattice. Here we show that even thermodynamically stable, well-ordered surfaces can be surprisingly reactive. Specifically, we show that all the 3-fold coordinated lattice oxygen atoms on a defect-free single-crystalline "r-cut" (1 (1) over bar 02) surface of hematite (alpha-Fe2O3) are exchanged with oxygen from surrounding water vapor within minutes at temperatures below 70 degrees C, while the atomic-scale surface structure is unperturbed by the process. A similar behavior is observed after liquid-water exposure, but the experimental data clearly show most of the exchange happens during desorption of the final monolayer, not during immersion. Density functional theory computations show that the exchange can happen during on-surface diffusion, where the cost of the lattice oxygen extraction is compensated by the stability of an HO-HOH-OH complex. Such insights into lattice oxygen stability are highly relevant for many research fields ranging from catalysis and hydrogen production to geochemistry and paleoclimatology.

Keywords

atomic-scale view; low-temperature; isotope-exchange; oxide; adsorption; surface; stabilization; CO; dissociation; dissolution

Authors

JAKUB, Z.; MEIER, M.; KRAUSHOFER, F.; BALAJKA, J.; PAVELEC, J.; SCHMID, M.; FRANCHINI, C.; DIEBOLD, U.; PARKINSON, G.

Released

10. 11. 2021

Publisher

Nature Portfolio

Location

BERLIN

ISBN

2041-1723

Periodical

NATURE COMMUNICATIONS

Year of study

12

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

8

Pages count

8

URL

https://www.nature.com/articles/s41467-021-26601-4

Full text in the Digital Library

http://hdl.handle.net/11012/203101

BibTex

@article{BUT174929,
  author="Zdeněk {Jakub} and Matthias {Meier} and Florian {Kraushofer} and Jan {Balajka} and Jiří {Pavelec} and Michael {Schmid} and Cesare {Franchini} and Ulrike {Diebold} and Gareth S. {Parkinson}",
  title="Rapid oxygen exchange between hematite and water vapor",
  journal="NATURE COMMUNICATIONS",
  year="2021",
  volume="12",
  number="1",
  pages="1--8",
  doi="10.1038/s41467-021-26601-4",
  issn="2041-1723",
  url="https://www.nature.com/articles/s41467-021-26601-4"
}