Ionic Liquid Reference Electrodes With a Well-Controlled Co(II)/Co(III) Redox Buffer as Solid Contact

Xu U. Zou, Li D. Chen, Chun Ze Lai, Philippe Bühlmann

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Solid-contact reference electrodes that comprise a polymeric reference membrane doped with an ionic liquid are an alternative to conventional reference electrodes with a salt bridge. To enhance the electrode-to-electrode reproducibility of solid-contact reference electrodes, a hydrophobic redox buffer consisting of the Co(III) and Co(II) complexes of 1,10-phenanthroline ([Co(phen)3]3+/2+) was incorporated into these reference membranes, providing redox buffer capacity at the interface of the reference membrane and the underlying solid electron conductor. As required for proper functioning, the E° of these reference electrodes is not sample dependent and exhibits a good electrode-to-electrode reproducibility, with a standard deviation as low as 2.1mV.

Original languageEnglish (US)
Pages (from-to)602-608
Number of pages7
JournalElectroanalysis
Volume27
Issue number3
DOIs
StatePublished - Mar 1 2015

Keywords

  • Ionic liquid
  • Redox buffer
  • Reference electrode
  • Solid contact

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