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Related Experiment Videos

Oxygen dissociation at Pt steps.

P Gambardella1, Z Sljivancanin, B Hammer

  • 1Institut de Physique Expérimentale, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.

Physical Review Letters
|August 11, 2001
PubMed
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Oxygen (O2) dissociation on platinum (Pt) stepped surfaces is most reactive at step edges. Silver (Ag) decoration stabilizes precursor and transition states, enhancing reactivity without lowering energy barriers.

Area of Science:

  • Surface science
  • Heterogeneous catalysis
  • Materials science

Background:

  • Understanding oxygen (O2) dissociation on platinum (Pt) surfaces is crucial for catalysis.
  • Pt(111) stepped surfaces offer unique reactive sites compared to flat surfaces.

Purpose of the Study:

  • To characterize O2 dissociation on Pt(111) stepped surfaces at the atomic scale.
  • To investigate the role of step decoration with silver (Ag) in tuning reactivity.

Main Methods:

  • Scanning tunneling microscopy (STM) for atomic-scale imaging.
  • Thermal energy atom scattering (TEAS) for surface dynamics.
  • Density functional theory (DFT) for electronic structure calculations.

Main Results:

Related Experiment Videos

  • The most reactive site for O2 dissociation was identified at the top of Pt steps.
  • In both the molecular precursor state (MPS) and transition state (TS), O2 molecules align parallel to the step edge.
  • Silver (Ag) monatomic chains decorated Pt step sites, locally tuning reactivity.

Conclusions:

  • Enhanced reactivity at Pt step sites is attributed to the stabilization of both the MPS and TS.
  • This stabilization occurs without a decrease in local dissociation barriers from the MPS.
  • Atomic-scale control of surface reactivity is achievable through targeted step decoration.