Atypical electric behavior of the double layer. Experimental case studies: Rh(111) in aqueous HCl solutions, and Au(111) in an ionic liquid, BMIPF 6

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4 Citations (Scopus)

Abstract

Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and zero-charge-potential measurements have been performed for the title systems. The results of the Rh(111)/aqueous HCl solutions demonstrate that in solutions of binary electrolytes with adsorbing anions the interfacial impedance is a single, indivisible element, even if its frequency dependence implies a four-element circuit. The measurements on Au(111) in 1-butyl- 3-methylimidazolium hexafluorophosphate (BMIPF6) reveal that double-layer formation and rearrangement in ionic liquids are very slow processes manifesting themselves as a parallel combination of a capacitance and a constant phase element (CPE).

Original languageEnglish
Pages (from-to)259-268
Number of pages10
JournalPure and Applied Chemistry
Volume83
Issue number2
DOIs
Publication statusPublished - 2011

Fingerprint

Ionic Liquids
Ionic liquids
Electrochemical impedance spectroscopy
Electrolytes
Cyclic voltammetry
Anions
Capacitance
Negative ions
Networks (circuits)
1-butyl-3-methylimidazolium hexafluorophosphate

Keywords

  • Electrochemistry
  • Equivalent circuits
  • Impedance
  • Ionic liquids
  • Single crystals

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

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abstract = "Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and zero-charge-potential measurements have been performed for the title systems. The results of the Rh(111)/aqueous HCl solutions demonstrate that in solutions of binary electrolytes with adsorbing anions the interfacial impedance is a single, indivisible element, even if its frequency dependence implies a four-element circuit. The measurements on Au(111) in 1-butyl- 3-methylimidazolium hexafluorophosphate (BMIPF6) reveal that double-layer formation and rearrangement in ionic liquids are very slow processes manifesting themselves as a parallel combination of a capacitance and a constant phase element (CPE).",
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N2 - Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and zero-charge-potential measurements have been performed for the title systems. The results of the Rh(111)/aqueous HCl solutions demonstrate that in solutions of binary electrolytes with adsorbing anions the interfacial impedance is a single, indivisible element, even if its frequency dependence implies a four-element circuit. The measurements on Au(111) in 1-butyl- 3-methylimidazolium hexafluorophosphate (BMIPF6) reveal that double-layer formation and rearrangement in ionic liquids are very slow processes manifesting themselves as a parallel combination of a capacitance and a constant phase element (CPE).

AB - Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and zero-charge-potential measurements have been performed for the title systems. The results of the Rh(111)/aqueous HCl solutions demonstrate that in solutions of binary electrolytes with adsorbing anions the interfacial impedance is a single, indivisible element, even if its frequency dependence implies a four-element circuit. The measurements on Au(111) in 1-butyl- 3-methylimidazolium hexafluorophosphate (BMIPF6) reveal that double-layer formation and rearrangement in ionic liquids are very slow processes manifesting themselves as a parallel combination of a capacitance and a constant phase element (CPE).

KW - Electrochemistry

KW - Equivalent circuits

KW - Impedance

KW - Ionic liquids

KW - Single crystals

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