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Berlin 2012 – scientific programme

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O: Fachverband Oberflächenphysik

O 57: Solid / liquid interfaces II

O 57.8: Talk

Wednesday, March 28, 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.

M. B. Glauert, J. Flui Mech. 1, 1956, 625.
J. Yamada et al., J. Electroanal. Chem. 148, 1983, 201.
A. N. Frumkin et al., Z. Elektrochem. 62, 1958, 252.
W. J. Albery, J. Electroanal. Chem. 191, 1985, 1.
R. G. Compton et al., J.Appl. Eletrochem. 21, 1991, 295.

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