Mass transport and modulation effects in rocking dual-semi-disc electrode voltammetry

Sunyhik D. Ahn, Paul E. Frith, Adrian C. Fisher, Alan M. Bond, Frank Marken

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

A hydrodynamic electrochemical method based on a rocking disc system with 90° amplitude and a frequency range of 0.83-16.7 Hz is reported. The system is versatile and similar in characteristics to the familiar rotating disc voltammetry method (e.g. providing a uniform diffusion layer but without sliding contacts), except for the more complex flow pattern imposed by the oscillatory movement. A Levich-type mass transport limited current response linear with the square root of rocking frequency is obtained. Additionally, a dual-semi-disc generator-collector system is demonstrated and characterised for the one-electron quasi-reversible Fe(CN)63-/4- redox couple. Generator-collector current efficiencies vary from 3% to 6% and characteristic transient concentration modulation effects are observed suitable for Fourier transform analysis. Rotational asymmetry in the flow pattern is detected.

Original languageEnglish
Pages (from-to)78-82
Number of pages5
JournalJournal of Electroanalytical Chemistry
Volume722-723
Issue number2
Early online date14 Mar 2014
DOIs
Publication statusPublished - 1 May 2014

Keywords

  • Diffusion
  • Electron transfer
  • Hydrodynamics
  • Rotating disc voltammetry
  • Transport
  • Turbulence

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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