The interface between Au(1 1 1) and an ionic liquid

M. Gnahm, T. Pajkossy, D. M. Kolb

Research output: Article

112 Citations (Scopus)

Abstract

The electrochemical interface between Au(1 1 1) and 1-butyl-3-methyl- imidazolium hexafluorophosphate has been studied by cyclic voltammetry and electrochemical impedance spectroscopy in a potential range, which might be considered to be the double-layer charging region for Au(1 1 1) is such an environment. The corresponding equivalent circuit is given by a capacity in parallel to a constant phase element (CPE). The high-frequency value of the capacity - that is, the double-layer capacitance - is about 6-7 μF/cm 2 over the whole potential range under study, whereas the CPE peaks at a potential, which coincides with the potential of zero total charge (pztc), as determined by immersion experiments. This latter element expresses the kinetics of the re-structuring of the interfacial region. In situ STM measurements reveal marked structural differences positive and negative of the pztc.

Original languageEnglish
Pages (from-to)6212-6217
Number of pages6
JournalElectrochimica Acta
Volume55
Issue number21
DOIs
Publication statusPublished - aug. 30 2010

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ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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