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O: Fachverband Oberflächenphysik

O 17: Solid-Liquid Interfaces I: Reactions and Electrochemistry

O 17.9: Vortrag

Montag, 16. März 2020, 17:30–17:45, TRE Phy

Entropy change during specific anion adsorption on Au(111) — •Marco Schönig and Rolf Schuster — Karlsruhe Institute of Technology, Germany

The understanding of specific adsorption is of fundamental importance for the description of the electrochemical double-layer(EDL). We used electrochemical microcalorimetry to investigate the specific adsorption of anions (Cl-,Br-, I-) on Au(111) from different electrolytes. Thereby we measure the reversibly exchanged heat during the anion adsorption/desorption process, which is directly correlated with the reaction entropy of the half cell reaction [1]. For all electrolytes we found negative reaction entropy for the adsorption process, with a distinct minimum around half coverage. We provide an interpretation of the data on the basis of a lattice gas model considering adsorbed ions and solvent molecules. [1]K. Bickel, K.D. Etzel, V. Halka and R. Schuster, Electrochim. Acta 2013, 112,801. *