Voltammetry of electroactive oil droplets. Part I: Numerical modelling for three mechanistic models using the dual reciprocity finite element method

Qiu Fulian, Jon C. Ball, Frank Marken, Richard G. Compton, Adrian C. Fisher

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Diffusion problems encountered for the case of electrochemical conversion of microdroplets of an electroactive oil deposited on an electrode are studied by the dual reciprocity finite element simulation method (DRM). Three plausible mechanistic models are compared. For a microdroplet of electroactive material A) the electrochemical reaction commences from the oil-electrode surface interphase; B) there is rapid charge conduction over the droplet surface so that ion insertion occurs from the droplet-aqueous electrolyte interface; C) the electrochemical reaction occurs only at the three phase boundary oil-aqueous electrolyte-electrode. Cyclic voltammograms and potential step transient responses are simulated. The dimensionless peak current and peak separation as a function of dimensionless scan rate are presented and a comparison of the three mechanistic models shows distinctly different behaviors. The normalized transient currents as a function of normalized time are given and compared for the three mechanistic models. The results provide a clear basis for the mechanistic characterization of real systems ill terms of the three models considered.

Original languageEnglish
Pages (from-to)1012-1016
Number of pages5
JournalElectroanalysis
Volume12
Issue number13
DOIs
Publication statusPublished - 13 Dec 2000

Keywords

  • Chronoamperometry
  • Cyclic voltammetry
  • Diffusion
  • Disk electrode
  • Dual reciprocity method (DRM)
  • Finite element modelling
  • Hemisphere electrode
  • Ionic liquids
  • Simulation
  • Three phase boundary

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry

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