Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 82: Metal Substrates II
O 82.9: Vortrag
Donnerstag, 3. April 2014, 18:00–18:15, WIL A317
Investigation of ice on Ag(111) via scanning tunneling microscopy: Kinetics and thermodynamics
— •Cord Bertram, Karsten Lucht, and Karina Morgenstern — Lehrstuhl für Physikalische Chemie I, Ruhr-Universität Bochum, Universitätsstraße 150, 44801 Bochum
As a member of the dipolar liquids and a well-known solvent, water is a very important component in electro-catalysis. For a further understanding of the microscopic processes taking part in electro-catalytic reactions, the local rearrangement of molecules in frozen water on Cu(111) in presence of an electrical field has recently been studied by scanning tunneling microscopy1. However, the local rearrangement depends highly on the coordination of the water molecules within the ice structure, which largely influences its ability to solvate ions or electrons. Therefore water structures on Cu(111) and on Ag(111) are studied. These surfaces with a difference in adsorption energy show substrate-mediated structure formation due to lattice mismatch effects. Additionally different preparation procedures result in structural differences, which can be explained by kinetic and thermodynamic processes. The consideration of these effects leads to new candidates for the microscopic observation of ion solvation.
1Mehlhorn et al.: Chem Electro Chem (2013) in print