The interface between HOPG and 1-butyl-3-methyl-imidazolium hexafluorophosphate

C. Müller, K. Németh, S. Vesztergom, T. Pajkossy, T. Jacob

Research output: Contribution to journalArticle

16 Citations (Scopus)


The interface between highly oriented pyrolytic graphite (HOPG) and 1-butyl-3-metyl-imidazolium hexafluorophosphate (BMIPF6) has been studied using cyclic voltammetry, electrochemical impedance spectroscopy, immersion charge measurements and in situ scanning tunneling microscopy (in situ STM). The results are compared with those obtained with Au(100) in BMIPF6 (Phys. Chem. Chem. Phys., 2011, 13, 11627). The main result is that the high frequency capacitance spectra on the two systems are similar to each other, however at low frequencies some slow interfacial processes cause the appearance of a second capacitance arc on Au(100), which is absent for HOPG. The slow processes are attributed to the rearrangement of the Au surface structure and to the formation of ionic liquid adlayers - these are visualized by in situ STM.

Original languageEnglish
Pages (from-to)916-925
Number of pages10
JournalPhysical Chemistry Chemical Physics
Issue number2
Publication statusPublished - Nov 27 2015

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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