Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 57: Electronic structure of surfaces: Spectroscopy, surface states II

O 57.4: Vortrag

Mittwoch, 14. März 2018, 11:30–11:45, MA 042

A three electrodes electrochemical setup for XPS studies in ionic liquids — •Francesco Greco, Radha Gobinda Bhuin, Hans-Peter Steinrück, and Florian Maier — Lehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen

Ionic liquids (ILs) are widely used in electrochemical studies due to their large electrochemical window, good ionic conductivity and thermal stability. These properties together with their extremely low vapor pressure make them unique candidates to perform electrochemistry in liquid media in combination with ultra-high-vacuum-based surface science techniques. In this work, a three electrodes electrochemical cell for X-ray-Photoelectron-Spectroscopy (XPS) studies has been developed, which allows in-situ cyclic voltammetry and chronoamperometry using the molybdenum sample holder as counter electrode, a platinum wire as quasi-reference electrode and a wire of chosen material as working electrode. The experiments are performed in a "Dual Analyzer System for Surface Analysis (DASSA)"[1] which enables angle-resolved X-ray Photoelectron Spectroscopy (ARXPS) using two electron analyzers mounted for simultaneous measurements in 0° (bulk-sensitive) and 80° (surface-sensitive) emission relative to the surface normal.

F.G., R.G.B. and H.P.S. thank the ERC for financial support through an Advanced Investigator Grant to H.P.S.!

[1] I. Niedermaier, C. Kolbeck, H.-P. Steinrück, F. Maier, Rev. Sci. Instrum. 87 (2016) 045105