Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 45: Poster: Solid-Liquid Interfaces - Structure, Spectroscopy, Reactions and Electrochemistry

O 45.13: Poster

Dienstag, 13. März 2018, 18:15–20:30, Poster A

In situ Video-STM Studies of Sulfide Adsorbate Dynamics on Ag(100) in Iodide Solution — •Reihaneh Amirbeigiarab, Bjoern Rahn, and Olaf M. Magnussen — Kiel University

Atomic scale dynamic processes at the interface between electrodes and electrolyte solutions play a pivotal role in electrochemical phase formation reactions. Accordingly, the evaluation of the atomic scale surface dynamic processes on metal electrodes, such as adsorbate diffusion and interaction, is of great importance to understand the reaction mechanisms at solid/liquid interfaces. In situ video-STM allows direct atomic-scale studies of these highly dynamic processes on electrode surfaces. [1-3] We here present results of in situ Video-STM studies on the dynamic behavior of low coverages of sulfide adsorbates on Ag(100) electrode surfaces in iodide-containing solution. We observe clear differences in the potential-dependend diffusion behavior on surfaces covered by a c(2×2)-I coadsorbate layer and by a disordered iodide adlayer, respectively. Futhermore, restructuring of the Ag substrate is found, leading to nanoscale grooves. The results are compared to previous data for sulfide on c(2×2)-Cl and c(2×2)-Br covered Ag(100). [1] T. Tansel, O. M. Magnussen, Phys. Rev. Lett., 96, 026101. (2006) [2] A.Taranovskyy, T. Tansel, O.M. Magnussen, Phys. Rev. Lett., 104, 106101.(2010) [3] Y. C. Yang, A. Taranovskyy, O. M. Magnussen, Angew. Chem. Int. Ed., 51, 1966. (2012)