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Adsorbate isotherm analysis by reflection anisotropy spectroscopy on copper (110) in hydrochloric acid

DOI: 10.1021/acs.jpcc.9b11326 DOI Help

Authors: Saul Vazquez-Miranda (Johannes Kepler Universität; Universidad Autónoma de San Luis Potosı́) , Vladyslav Solokha (Johannes Kepler Universität; Diamond Light Source) , Raul E. Balderas-Navarro (Universidad Autónoma de San Luis Potosi) , Kurt Hingerl (Johannes Kepler Universität) , Christoph Cobet (Johannes Kepler Universität)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: The Journal Of Physical Chemistry C

State: Published (Approved)
Published: February 2020

Open Access Open Access

Abstract: Reflectance anisotropy spectroscopy (RAS) is a powerful optical probe that works on a polarization contrast basis. It can be operated in any environment, ranging from ultrahigh vacuum to vapor phases and liquids. The measured optical anisotropies are caused by several symmetry breaking effects and are exclusively assigned to the surface for otherwise bulk isotropic materials. In this work, we present a systematic study comprising in situ RAS-transient to assess the surface thermodynamics of the chloride adsorption on Cu(110) upon systematic variations of the applied electrode potentials in comparison to cyclic voltammetry (CV). Numerical time-derivatives of the measured RAS-transients are shown to be exclusively associated with electrical currents of those electrochemical reactions, which change the properties of the electrode surface. The recorded transient line-shapes track the Frumkin type isotherm properties related to chloride coverage. Both connections are theoretically discussed. Owing to the surface and interface specificity, RAS is shown to exhibit a high surface sensitivity. In particular, processes taking place in parallel, namely, the hydrogen evolution reaction (HER) as well as the copper dissolution as Cu+ and Cu2+, do not contribute to the RAS response.

Journal Keywords: Isotherms; Copper; Adsorption; Ions; Dissolution

Subject Areas: Chemistry


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Added On: 25/02/2020 09:41

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Physical Chemistry Chemistry

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