Ms. Sabrina Tietze Profile

Sabrina Tietze

at Hochschule Coburg

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Proceedings Article | 7 December 2013 Paper

Influence of surface acoustic waves induced acoustic streaming on the kinetics of electrochemical reactions

Sabrina Tietze, Josefine Schlemmer, Gerhard Lindner

Proceedings Volume 8923, 89231B (2013) https://doi.org/10.1117/12.2033694

KEYWORDS: Acoustics, Electrodes, Diffusion, Transducers, Copper, Polishing, Liquids, Wave plates, Wave propagation, Surface finishing

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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.

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