Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 67: Poster Wednesday: Solid-Liquid Interfaces
O 67.1: Poster
Mittwoch, 3. April 2019, 17:45–20:00, Poster B2
Structure of electric double layer at the graphene/ionic liquid interface probed by X-ray photoelectron spectroscopy — •Sunghwan Shin1, Francesco Greco1, Elmar Kataev1, Olesya Kapitanova2, Florian Maier1, and Hans-Peter Steinruck1 — 1Friedrich-Alexander University Erlangen-Nürnberg, 91058, Erlangen, Germany — 2Lomonosov Moscow State University, Leninskie gory, 119991 Moscow, Russia
Ionic liquids (ILs) electrochemical interfaces find applications in fuel cells, supercapacitors, and dye-sensitized solar cells. However, in situ analysis of these interfaces is difficult because of their inaccessibility to the surface science tools. Here, we report a photoemission study of electric double layer (EDL) formation on the graphene/IL electrolyte (1-methyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide) using a two-electrode electrochemical cell with graphene-covered porous silicon nitride membrane as a working electrode and a platinum wire as a counter electrode.
Cathodic and anodic polarization of graphene electrode up to 2V resulted in an asymmetric broadening of the peak in F 1s photoemission spectrum towards lower or higher binding energies correspondingly. For explaining this data, we developed a model consisting of EDL at the graphene/IL interface and a confined layer of IL situated between the graphene layer and the silicon nitride support and assign these shifts to the voltage drop at the working electrode.
Supported by the European Research Council (ERC) through an Advanced Investigator Grant to HPS (No. 693398*ILID).