Generator-collector voltammetry at dual-plate gold-gold microtrench electrodes as diagnostic tool in ionic liquids

Miguel AngelMontiel, Jesus Iniesta, Andrew J. Gross, Thies Thiemann, Frank Marken

Research output: Contribution to journalArticle

3 Citations (Scopus)
137 Downloads (Pure)

Abstract

Ionic liquids provide high viscosity solvent environments with interesting voltammetric characteristics and new electrochemical mechanisms. Here, a gold-gold dual-plate microtrench electrode is employed in generator-collector mode to enhance viscosity-limited currents in ionic liquids due to fast feedback within small inter-electrode gaps (5μm inter-electrode gap, 27μm microtrench depth) and to provide a mechanistic diagnosis tool. Three redox systems in the ionic liquid BMIm+BF4- are investigated: (i) ferrocene oxidation, (ii) oxygen reduction, and (iii) 2-phenyl-naphthyl-1,4-dione reduction. Both transient and steady state voltammetric responses are compared. Asymmetric diffusion processes, reaction intermediates, and solubility changes in the ionic liquid are revealed.

Original languageEnglish
Pages (from-to)1068-1076
JournalElectroanalysis
Volume28
Issue number5
Early online date21 Dec 2015
DOIs
Publication statusPublished - May 2016

Keywords

  • Diffusion
  • Feedback
  • Ionic liquid
  • Oxygen
  • Sensing
  • Voltammetry

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