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Proceedings Paper

Influence of surface acoustic waves induced acoustic streaming on the kinetics of electrochemical reactions
Author(s): Sabrina Tietze; Josefine Schlemmer; Gerhard Lindner
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Paper Abstract

The kinetics of electrochemical reactions is controlled by diffusion processes of charge carriers across a boundary layer between the electrode and the electrolyte, which result in a shielding of the electric field inside the electrolyte and a concentration gradient across this boundary layer. In accumulators the diffusion rate determines the rather long time needed for charging, which is a major drawback for electric mobility. This diffusion boundary can be removed by acoustic streaming in the electrolyte induced by surface acoustic waves propagating of the electrode, which results in an increase of the charging current and thus in a reduction of the time needed for charging. For a quantitative study of the influence of acoustic streaming on the charge transport an electropolishing cell with vertically oriented copper electrodes and diluted H3PO4-Propanol electrolytes were used. Lamb waves with various excitation frequencies were exited on the anode with different piezoelectric transducers, which induced acoustic streaming in the overlaying electrolytic liquid. An increase of the polishing current of up to approximately 100 % has been obtained with such a set-up.

Paper Details

Date Published: 7 December 2013
PDF: 8 pages
Proc. SPIE 8923, Micro/Nano Materials, Devices, and Systems, 89231B (7 December 2013); doi: 10.1117/12.2033694
Show Author Affiliations
Sabrina Tietze, Hochschule Coburg (Germany)
Josefine Schlemmer, Hochschule für angewandte Wissenschaften und Künste Coburg (Germany)
Gerhard Lindner, Hochschule für angewandte Wissenschaften und Künste Coburg (Germany)

Published in SPIE Proceedings Vol. 8923:
Micro/Nano Materials, Devices, and Systems
James Friend; H. Hoe Tan, Editor(s)

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