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Dielectric profile at the Pt(111)/water interface.

Jia-Xin Zhu1, Jun Cheng1,2,3, Katharina Doblhoff-Dier4

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The dielectric constant near metal surfaces is complex. Our study reveals a low dielectric region at the interface, impacting electrochemical double-layer capacitance and kinetics.

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Computational Materials Science

Background:

  • The dielectric constant is a key parameter in electrochemical interface models.
  • Understanding its behavior at atomic scales, especially near surfaces, is crucial for accurate modeling.

Purpose of the Study:

  • To investigate the electronic contribution to the dielectric constant (ɛr(z)) as a function of distance (z) from a Pt(111) surface.
  • To elucidate the factors governing the dielectric profile at metal-water interfaces.

Main Methods:

  • Ab initio calculations.
  • Machine-learned molecular dynamics simulations.

Main Results:

  • The dielectric profile near the Pt(111) surface is a combination of metallic and water responses.
  • Metal-water bonding induces elongated, polarizable orbitals, enhancing the dielectric response slightly.
  • A region with a significantly low dielectric constant exists near the surface before orientational response develops.

Conclusions:

  • The low dielectric region near the interface limits double-layer capacitance values.
  • This finding has implications for interpreting double-layer capacitance, surface electric fields, and electrochemical kinetics.