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Structural evidence for a Stern layer of cations was found at electrified interfaces. This finding supports predictions for highly charged electrochemical double layers (EDL) near hydrogen evolution potentials.

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Area of Science:

  • Electrochemistry
  • Surface Science
  • Materials Science

Background:

  • Electrochemical double layers (EDL) are crucial at electrified interfaces.
  • The Gouy-Chapman model explains moderately charged EDL.
  • Stern layers were theoretically predicted for highly charged EDL.

Purpose of the Study:

  • To provide structural evidence for the formation of Stern layers.
  • To investigate cation layering at highly charged EDL.
  • To examine EDL structure near hydrogen evolution potentials.

Main Methods:

  • X-ray crystal truncation rod measurements.
  • Atomic-scale recoil response analysis of Pt(111) surface layers.
  • Glancing-incidence in-plane diffraction for in-layer ordering.

Main Results:

  • Observed structural evidence of a cation Stern layer.
  • Confirmed cation layering at potentials near hydrogen evolution.
  • Demonstrated ordered cation arrangement within the Stern layer.

Conclusions:

  • The study provides direct structural evidence for Stern layer formation.
  • Results validate theoretical predictions for highly charged EDL.
  • Understanding Stern layers is key for interfacial electrochemical processes.