Ion transport across liquid vertical bar liquid interfacial boundaries monitored at generator-collector electrodes

A Vuorema, H Meadows, N Bin Ibrahim, J Del Campo, M Cortina-Puig, M Y Vagin, A A Karyakin, M Sillanpaa, Frank Marken

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10 Citations (Scopus)

Abstract

Anion transfer processes at a liquid vertical bar liquid interface were studied with an interdigitated gold band array electrode. The organic phase, 4-(3-phenylpropyl)-pyridine containing Co(II) phthalocyanine, was immobilised as random droplets at the electrode surface and then immersed into aqueous electrolyte. Oxidation of Co(II) phthalocyanine at the generator electrode was shown to be associated with anion transfer from the aqueous into the organic phase. The corresponding back reduction at the collector electrode with anion expulsion was delayed by the anion/cation diffusion time across the interelectrode gap. A working curve based on a finite difference numerical simulation model was employed to estimate the apparent diffusion coefficients for anions in the organic phase (PF6- < ClO4- < NO3-). Potential applications in ion analysis are discussed.
Original languageEnglish
Pages (from-to)2889-2896
Number of pages8
JournalElectroanalysis
Volume22
Issue number24
DOIs
Publication statusPublished - Dec 2010

Keywords

  • collector
  • cobalt
  • triple phase boundary
  • generator
  • ion transfer
  • 4-(3-Phenylpropyl)-pyridine
  • interdigitated array
  • phthalocyanine
  • gold electrode
  • electrochemistry

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