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Related Experiment Videos

Oxidation of Pt(110).

W X Li1, L Osterlund, E K Vestergaard

  • 1Interdisciplinary Nanoscience Center, Center for Atomic-scale Materials Physics, and Department of Physics and Astronomy, University of Aarhus, DK 8000 Aarhus C, Denmark.

Physical Review Letters
|November 5, 2004
PubMed
Summary
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Researchers studied platinum (Pt) surfaces under oxidizing conditions. They discovered that ordered surface oxide islands form and coexist with a stable oxygen chemisorption structure, revealing insights into platinum oxidation.

Area of Science:

  • Surface science
  • Materials science
  • Oxidation chemistry

Background:

  • Platinum (Pt) surfaces are crucial in catalysis.
  • Understanding Pt oxidation is key for controlling surface reactivity.
  • Oxidizing conditions can significantly alter Pt surface structures.

Purpose of the Study:

  • To investigate the Pt(110) surface under strongly oxidizing conditions.
  • To characterize the formation and structure of platinum oxides.
  • To elucidate the stability and formation mechanisms of surface oxides.

Main Methods:

  • Scanning tunneling microscopy (STM) for surface imaging.
  • Temperature programmed desorption (TPD) for surface analysis.
  • Density functional theory (DFT) calculations for theoretical modeling.

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Main Results:

  • Disordered Pt oxide structures observed at low temperatures.
  • Ordered surface oxide islands form upon annealing.
  • A stable reconstructed (12x2)-O chemisorption structure coexists with oxides.
  • DFT calculations reveal a metastable surface oxide phase.

Conclusions:

  • The surface oxide phase is metastable.
  • Stabilizing defects in the chemisorption layer contribute to oxide presence.
  • Reduced platinum mobility plays a role in oxide formation and stability.