Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 15: Solid-Liquid Interfaces 2: Structure and Spectroscopy
O 15.8: Vortrag
Montag, 5. September 2022, 17:00–17:15, S054
in-situ optical probe of chloride-induced surface states in Cu(110)/liquid interfaces — •Saul Vazquez-Miranda1, Kurt Hingerl1, and Christoph Cobet1,2 — 1Johannes Kepler Universität Linz Altenberger Straße 69 4040 Linz, Austria — 2Johannes Kepler Universität, Linz School of Education, A-4040 Linz, Austria
While surface states (SSs) appearance and role in metal-electrolyte interfaces are still a controversial debate. The existence of SSs, permits control and tunability of electronic properties of metal-electrolyte interfaces. Resonant excitations among them could enhance, e.g. photocatalytic reactions. SSs and other properties are readily adjustable via an applied electrical potential that is, by promoting changes in the adsorption of ionic species. The electrolyte induces additional scattering and screening effects, so that the electron charge distributions can differ considerably in the presence of high electric fields. We report, by means of electrochemical impedance spectroscopy (EIS) jointly with in-situ reflectance anisotropy spectroscopy (RAS), which aimed to assess the evolution of surface properties and SSs occurring at Cu (110) in contact with an HCl solution. Thereafter, by modeling the RAS response and in comparison with EC-STM measurements, specific surface structures have been identified and ascribed to the optical response. In a specific potential range, three additional resonances are detected in RAS that can be explained by two-dimensional confined SSs.