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Pure and Applied Chemistry

The Scientific Journal of IUPAC

Ed. by Burrows, Hugh / Stohner, Jürgen

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Volume 83, Issue 2


Atypical electric behavior of the double layer. Experimental case studies: Rh(111) in aqueous HCl solutions, and Au(111) in an ionic liquid, BMIPF6

Tamás Pajkossy
  • Corresponding author
  • Institute of Materials and Environmental Chemistry, Chemical Research Center, Hungarian Academy of Sciences, Pusztaszeri út 59-67, Budapest H-1025, Hungary
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Published Online: 2010-11-02 | DOI: https://doi.org/10.1351/PAC-CON-10-06-10

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).

Keywords: electrochemistry; equivalent circuits; impedance; ionic liquids; single crystals


Regional Symposium on Electrochemistry: South East Europe (RSE SEE-2), 2nd, Belgrade, Serbia, 2010-06-06–2010-06-10


About the article

Published Online: 2010-11-02

Published in Print: 2010-11-02

Citation Information: Pure and Applied Chemistry, Volume 83, Issue 2, Pages 259–268, ISSN (Online) 1365-3075, ISSN (Print) 0033-4545, DOI: https://doi.org/10.1351/PAC-CON-10-06-10.

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