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The structure of the electrochemical double layer: Ag(111) in alkaline electrolyte

DOI: 10.1016/j.elecom.2011.08.043 DOI Help

Authors: Christopher A. Lucas (University of Liverpool) , Paul Thompson (University of Liverpool; European Synchrotron Radiation Facility) , Yvonne Grunder (University of Manchester) , Nenad M. Markovic (Argonne National Laboratory)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Electrochemistry Communications , VOL 13 (11)

State: Published (Approved)
Published: September 2011

Abstract: The structure of the electrochemical double layer at the interface between a Ag(111) electrode and 0.1 M KOH electrolyte has been probed using in-situ surface X-ray scattering (SXS). Detailed modeling of the SXS data at negative potential (E = ? 1.0 V versus SCE) is consistent with the presence of an hydrated K+ cation layer at a distance of 4.1 ± 0.3 Å from the Ag surface and at positive potential (E = ? 0.2 V), indicates that the presence of OHad stabilizes the hydrated K+ cations through a non-covalent interaction forming a compact double layer structure in which the Ag-K+ distance is reduced to 3.6 ± 0.2 Å.

Journal Keywords: X-Ray Scattering; Silver; Cations; Interface Structure; Hydroxide; Alkaline Electrolyte

Subject Areas: Physics, Chemistry

Instruments: I07-Surface & interface diffraction

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