Adsorption of water at the SrO surface of ruthenates

Daniel Halwidl, Bernhard Stöger, Wernfried Mayr-Schmölzer, Jiri Pavelec, David Fobes, Jin Peng, Zhiqiang Mao, Gareth S. Parkinson, Michael Schmid, Florian Mittendorfer, Josef Redinger, Ulrike Diebold

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Although perovskite oxides hold promise in applications ranging from solid oxide fuel cells to catalysts, their surface chemistry is poorly understood at the molecular level. Here we follow the formation of the first monolayer of water at the (001) surfaces of Srn+1RunO3n+1 (n = 1, 2) using low-temperature scanning tunnelling microscopy, X-ray photoelectron spectroscopy, and density functional theory. These layered perovskites cleave between neighbouring SrO planes, yielding almost ideal, rocksalt-like surfaces. An adsorbed monomer dissociates and forms a pair of hydroxide ions. The OH stemming from the original molecule stays trapped at Sr-Sr bridge positions, circling the surface OH with a measured activation energy of 187 ± 10 meV. At higher coverage, dimers of dissociated water assemble into one-dimensional chains and form a percolating network where water adsorbs molecularly in the gaps. Our work shows the limitations of applying surface chemistry concepts derived for binary rocksalt oxides to perovskites.

Original languageEnglish (US)
Pages (from-to)450-455
Number of pages6
JournalNature Materials
Volume15
Issue number4
DOIs
StatePublished - Apr 1 2016

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Surface chemistry
Adsorption
Oxides
adsorption
Water
water
perovskites
Scanning tunneling microscopy
Solid oxide fuel cells (SOFC)
Dimers
Perovskite
Density functional theory
Monolayers
chemistry
X ray photoelectron spectroscopy
Activation energy
Monomers
oxides
solid oxide fuel cells
guy wires

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Halwidl, D., Stöger, B., Mayr-Schmölzer, W., Pavelec, J., Fobes, D., Peng, J., ... Diebold, U. (2016). Adsorption of water at the SrO surface of ruthenates. Nature Materials, 15(4), 450-455. https://doi.org/10.1038/nmat4512
Halwidl, Daniel ; Stöger, Bernhard ; Mayr-Schmölzer, Wernfried ; Pavelec, Jiri ; Fobes, David ; Peng, Jin ; Mao, Zhiqiang ; Parkinson, Gareth S. ; Schmid, Michael ; Mittendorfer, Florian ; Redinger, Josef ; Diebold, Ulrike. / Adsorption of water at the SrO surface of ruthenates. In: Nature Materials. 2016 ; Vol. 15, No. 4. pp. 450-455.
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Halwidl, D, Stöger, B, Mayr-Schmölzer, W, Pavelec, J, Fobes, D, Peng, J, Mao, Z, Parkinson, GS, Schmid, M, Mittendorfer, F, Redinger, J & Diebold, U 2016, 'Adsorption of water at the SrO surface of ruthenates', Nature Materials, vol. 15, no. 4, pp. 450-455. https://doi.org/10.1038/nmat4512

Adsorption of water at the SrO surface of ruthenates. / Halwidl, Daniel; Stöger, Bernhard; Mayr-Schmölzer, Wernfried; Pavelec, Jiri; Fobes, David; Peng, Jin; Mao, Zhiqiang; Parkinson, Gareth S.; Schmid, Michael; Mittendorfer, Florian; Redinger, Josef; Diebold, Ulrike.

In: Nature Materials, Vol. 15, No. 4, 01.04.2016, p. 450-455.

Research output: Contribution to journalArticle

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AU - Peng, Jin

AU - Mao, Zhiqiang

AU - Parkinson, Gareth S.

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Halwidl D, Stöger B, Mayr-Schmölzer W, Pavelec J, Fobes D, Peng J et al. Adsorption of water at the SrO surface of ruthenates. Nature Materials. 2016 Apr 1;15(4):450-455. https://doi.org/10.1038/nmat4512