Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 57: Solid / liquid interfaces II

O 57.8: Vortrag

Mittwoch, 28. März 2012, 18:30–18:45, A 060

Development of an electrochemical flow-through cell for in situ characterization of UHV-fabricated model surfaces — •Otavio B. Alves and R. Jürgen Behm — Ulm University, Institute of Surface Chemistry and Catalysis, 89069 Ulm, Germany

We report on the assembly of a wall-jet type electrochemical flow cell for electrochemical and electrocatalytic characterization under controlled and continuous electrolyte flow, which is connected to an ultrahigh vacuum scanning tunneling microscopy (UHV-STM) system via a sample transfer system. The electrochemical set-up exhibits a "true" wall-jet hydrodynamic characteristics [1-2]; and offers a high sensitivity, low solution hold-up and reproducible mass-transfer conditions when coupled to a closed loop miniature flow controller. We will discuss the experimental verification of the theoretical predictions for the limiting diffusion current [2] at UHV prepared single crystalline electrodes. It will also be examined in how far the Frumkin-Tedoradze [3] or an analogous treatment [4-5] is suitable for describing the measured kinetic data.

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