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Issue 2, 2016
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The interface between HOPG and 1-butyl-3-methyl-imidazolium hexafluorophosphate

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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.

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

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Publication details

The article was received on 10 Sep 2015, accepted on 27 Nov 2015 and first published on 27 Nov 2015


Article type: Paper
DOI: 10.1039/C5CP05406K
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Phys. Chem. Chem. Phys., 2016,18, 916-925

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

    C. Müller, K. Németh, S. Vesztergom, T. Pajkossy and T. Jacob, Phys. Chem. Chem. Phys., 2016, 18, 916
    DOI: 10.1039/C5CP05406K

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