Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 45: Poster: Solid-Liquid Interfaces - Structure, Spectroscopy, Reactions and Electrochemistry
O 45.4: Poster
Dienstag, 13. März 2018, 18:15–20:30, Poster A
charge accumulation on copper electrode surfaces were studied by means of electrochemical and optical techniques — •Saúl Vázquez-Miranda1,2, Reza Sharif1, Kurt Hingerl1, and Christoph Cobet1 — 1Johannes Kepler Universität, Zentrum für Oberflächen und Nanoanalytik, Altenberger Str. 69, 4040 Linz, Austria — 2Universidad Autónoma de San Luis Potosí ,(IICO) Av, Karakorum 1470, 78216 San Luis Potosí, México
The surface chemistry occurring during electrocatalysis is the key to understand the reaction mechanism.Electrochemical and optical methods were used to investigate the charge accumulation at amorphous and single crystals of Cu surfaces interacting with a supra pure HCl solution.
The investigation of the adsorption/desorption of Cl- ions was carried out using cyclic voltammetry, in which the integrated charge and ion - exchange is measured in a potential window where we prevent damage of the copper surface.
Electrochemical impedance spectroscopy (EIS) measurement on the (111) and (110) faces of copper was used to extract capacitance and resistance parameters. Equivalent circuit modeling was used to suggest the potential of zero charges (PZC).
Spectroscopy Ellipsometry for in operando characterization allows to probe the solid/liquid interface directly while applying an external potential and during chronoamperometry. The correlation of these two techniques allows to shed light on the charge accumulation on the copper surface electrodes.