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Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 58: Poster Session III (Solid/liquid interfaces; Metals; Semiconductors; Oxides and insulators)

O 58.3: Poster

Mittwoch, 28. März 2012, 18:15–21:45, Poster B

GIXD and X-ray reflectivity studies on the mercury-electrolyte interface under potential control — •Sven Festersen1, Annika Elsen1, Benjamin Runge1, Oliver H. Seeck2, Moshe Deutsch3, Olaf M. Magnussen1, and Bridget M. Murphy11Institute for Experimental and Applied Physics, Christian-Albrechts-Universität, Kiel, Germany — 2PETRA III, DESY, Hamburg, Germany — 3PD, Bar-Ilan University, Ramat-Gan, Israel

The interface between mercury and electrolyte solutions has been subject of extensive electrochemical studies, but structural information is largely lacking up to now. To investigate the interface structure on atomic scales, in situ GIXD and X-ray reflectivity measurements on a mercury electrode in aqueous solution, containing NaF, NaBr and PbBr2, have been performed. Experiments were carried out at different potentials applied using the LISA liquid surface diffractometer at PETRA III (DESY, Hamburg). Using in situ x-ray reflectivity studies a potential dependent reversible adlayer formation at the mercury-electrolyte interface has been observed. Additional peaks in the reflectivity data also suggested electrochemical growth of 3D crystallites at the interface. The existence of the latter was confirmed by grazing incidence diffraction. The existence of partial powder rings indicates a preferred orientation of these crystallites with respect to the interface.

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