Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 9: Solid-Liquid Interfaces: Structure, Spectroscopy I

O 9.5: Vortrag

Montag, 20. März 2017, 11:30–11:45, WIL C307

Influence of lithium ions onto water structures on Au(111) — •Irene Weber and Karina Morgenstern — Chair of Physical Chemistry I, Ruhr-Universität Bochum

Providing information about solvation effects near the liquid-solid interface is of tremendous importance for the understanding of electrochemical processes, i.e. in electrocatalysis. However, the understanding of ions influencing water structures and dynamics near metal surfaces on the atomic scale is far from complete. In our study amorphous water and lithium ions are used to mimic fluid water and circular cations, respectively. We found that lithium ions do not adsorb at specific sites on Au(111) during adsorption at around 215 K and that water nucleation starts predominantly at the elbow sites of the herringbone reconstruction. Contrary to the weak interaction of water with Au(111), water molecules bind strongly to lithium ions on Au(111). Depending on the water-lithium ions-ratio, several types of interactions between water, lithium ions and the Au(111) substrate were determined. In this contribution we will review our recent variable-temperature Scanning Tunneling Microscopy (STM) studies of the influence of lithium ions onto amorphous ice structures on Au(111).