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Vacancy dynamics on CO-covered Pt(111) electrodes.

Jie Wei1, Yan-Xia Chen, Olaf M Magnussen

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Point defects observed on platinum (Pt) surfaces are identified as diffusing vacancies. These vacancies form due to the interaction of mobile carbon monoxide (CO) with Pt atoms at low potentials.

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Area of Science:

  • Surface Science
  • Electrochemistry
  • Materials Science

Background:

  • Understanding surface dynamics is crucial for catalysis.
  • Platinum (Pt) electrodes are vital in many electrochemical applications.
  • Carbon monoxide (CO) adsorption influences Pt surface properties.

Purpose of the Study:

  • To investigate the nature of defects on Pt(111) surfaces under CO adsorption.
  • To understand the dynamics and formation mechanisms of these defects.

Main Methods:

  • In situ video scanning tunneling microscopy (STM) studies.
  • Electrochemical experiments in CO-saturated sulfuric acid (H2SO4) solution.

Main Results:

  • Defined point defects were observed on the Pt(111) surface in the CO pre-oxidation regime.
  • These defects exhibit both mobile and immobile states.
  • Defects are generated at Pt steps and attributed to diffusing vacancies in the Pt surface layer.
  • Vacancy formation is induced by the interaction of mobile CO adsorbates with Pt surface atoms at potentials as low as 0.30 VAg/AgCl.

Conclusions:

  • The study reveals the dynamic nature of Pt surfaces under CO adsorption.
  • Diffusing vacancies are a key feature of the Pt surface structure in this regime.
  • These findings provide insights into surface reconstruction and defect dynamics relevant to electrocatalysis.