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

8 Citations (SciVal)

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

Funding

SDA thanks Inochem Ltd. and the Faculty of Science, University of Bath, for financial support. ACF thanks the Singapore National Research Foundation under its Campus for Research Excellence and Technological Enterprise (CREATE) programme. AMB thanks the DTC Sustainable Chemical Technologies for supporting a research visit to the University of Bath.

Keywords

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

ASJC Scopus subject areas

  • Analytical Chemistry
  • General Chemical Engineering
  • Electrochemistry

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