Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 84: Poster Session - Solid-Liquid Interfaces: Reactions and Electrochemisty
O 84.11: Poster
Wednesday, March 18, 2020, 18:15–20:00, P2/EG
In situ X-ray studies of electrodeposition at electrolyte-liquid metal interface — •Andrea Sartori1, Olaf Magnussen1,2, and Bridget Murphy1,2 — 1University of Kiel — 2Ruprecht Haensel Laboratory, Kiel
We investigate nucleation and growth by in situ x-ray reflectivity and diffraction at liquid-liquid interfaces, focusing on Hg as liquid metal substrate in an electrochemical environment. By changing the electrolyte concentration, species and potential we can control the deposition mechanism. Liquid electrodes provide a stresses and defects-free template for nucleation and growth and ensure high mobility of reagent and products leading to high quality crystals. In previous studies of electrolyte containing NaF+NaBr+PbBr2 the growth of a monolayer followed by 3D nanocrystal formation of PbBrF was observed. In the current experiments electrolytes were employed, which contain only a single halide aniona species, namely NaBr+PbBr2, NaCl+PbCl2 NaF+PbF2. Growth of Pb halide compounds is initiated by changing the potential from the amalgamation region, where the Pb2+ ions dissolve in the Hg, to a more positive potential, where the lead ions are deamalgamated. In all cases, a defined ultrathin adlayers are formed, followed by quasi-epitaxial growth of Pb-halides bulk crystals. These observations indicate that this growth behaviour is a general phenomenon.It may be explained by considering that for a potential positive of the amalgamation potential, the halide ions adsorb onto the Hg surface. When the Pb2+ is released from the Hg bulk, they coadsorbe on top of the halide adsorbate, resulting in adlayer formation.