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O: Fachverband Oberflächenphysik

O 45: Poster: Solid-Liquid Interfaces - Structure, Spectroscopy, Reactions and Electrochemistry

O 45.21: Poster

Tuesday, March 13, 2018, 18:15–20:30, Poster A

Assets and drawbacks of electrochemical/-catalytic characterization of electrodes prepared under UHV conditions — •Albert K. Engstfeld, Jens Klein, and R. Jürgen Behm — Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm

Our current understanding of the electrochemical/-catalytic properties of complex three dimensional catalyst materials is strongly based on single crystal studies, supported by theoretical studies. In general, the electrochemical properties are characterized on single crystal electrodes prepared under laboratory conditions. These findings are supported by separate UHV studies, in which the electronic and chemical properties of the surfaces are explored by surface sensitive techniques. In order to bridge the gap between UHV and laboratory studies, numerous attempts are presented in the literature over the last decades, where electrochemical techniques are combined with a UHV set-up.[1] In this work, we will first discuss the relevance of the respective approach to prepare single crystals with distinct structural properties under UHV conditions, which can be elucidated with STM measurements and present examples where a clean environment, such as UHV, is indispensable to obtain the respective electrodes. Furthermore, we will present different types of bimetallic structures which can only be formed under laboratory conditions and other types which can only be obtained under UHV conditions. Finally, we will discuss situations where the combination UHV-electrochemistry approach is highly advantageous to in situ electrocatalytic studies. [1] PCCP, 19 (2017) 4141