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

14 Citations (Scopus)

Abstract

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
Volume18
Issue number2
DOIs
Publication statusPublished - Nov 27 2015

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Graphite
pyrolytic graphite
Scanning tunneling microscopy
scanning tunneling microscopy
Capacitance
capacitance
Ionic Liquids
Electrochemical impedance spectroscopy
Surface structure
submerging
Cyclic voltammetry
arcs
impedance
low frequencies
causes
liquids
spectroscopy

ASJC Scopus subject areas

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

Cite this

The interface between HOPG and 1-butyl-3-methyl-imidazolium hexafluorophosphate. / Müller, C.; Németh, K.; Vesztergom, S.; Pajkossy, T.; Jacob, T.

In: Physical Chemistry Chemical Physics, Vol. 18, No. 2, 27.11.2015, p. 916-925.

Research output: Contribution to journalArticle

Müller, C. ; Németh, K. ; Vesztergom, S. ; Pajkossy, T. ; Jacob, T. / The interface between HOPG and 1-butyl-3-methyl-imidazolium hexafluorophosphate. In: Physical Chemistry Chemical Physics. 2015 ; Vol. 18, No. 2. pp. 916-925.
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