High-frequency sonoelectrochemical processes: Mass transport, thermal and surface effects induced by cavitation in a 500 kHz reactor

F. Javier Del Campo, B. A. Coles, F. Marken, R. G. Compton, E. Cordemans

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

The use of high frequency ultrasound in electrochemical systems is of major interest for the optimisation of electrosynthetic and electroanalytical procedures, especially when the strong mechanical effects of 20 kHz ultrasound are detrimental. The characterisation of a 500 kHz ultrasound reactor for sonoelectrochemical experiments by voltammetric and potentiometric measurements revealed the presence of considerable thermal, as well as mass transport, effects depending on geometric parameters and the material used for the construction of the working electrode. Micromixing and cavitation processes govern the mass transport to and from the electrode surface and are shown by atomic force microscopy (AFM) to cause erosion on the electrode surface. Electrochemically active films of Prussian blue are shown to be gradually removed by cavitation erosion. Degassing the solution prior to sonication increases the efficiency of cavitation processes.

Original languageEnglish
Pages (from-to)189-197
Number of pages9
JournalUltrasonics Sonochemistry
Volume6
Issue number4
DOIs
Publication statusPublished - Sep 1999

Keywords

  • Catalyst
  • Cavitation
  • Frequency effect
  • Mass transport
  • Micromixing
  • Modified electrode
  • Prussian blue
  • Sonoelectrochemistry

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Environmental Chemistry
  • Radiology Nuclear Medicine and imaging
  • Acoustics and Ultrasonics
  • Organic Chemistry
  • Inorganic Chemistry

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