Double layer structure of ionic liquids at the Au(111) electrode interface : an atomic force microscopy investigation

Hayes, Robert, Borisenko, Natalia, Tam, Matthew K., Howlett, Patrick C., Endres, Frank and Atkin, Rob 2011, Double layer structure of ionic liquids at the Au(111) electrode interface : an atomic force microscopy investigation, Journal of physical chemistry c, vol. 115, no. 14, pp. 6855-6863, doi: 10.1021/jp200544b.

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Title Double layer structure of ionic liquids at the Au(111) electrode interface : an atomic force microscopy investigation
Author(s) Hayes, Robert
Borisenko, Natalia
Tam, Matthew K.
Howlett, Patrick C.ORCID iD for Howlett, Patrick C.
Endres, Frank
Atkin, Rob
Journal name Journal of physical chemistry c
Volume number 115
Issue number 14
Start page 6855
End page 6863
Total pages 9
Publisher American Chemical Society
Place of publication Washington, D. C.
Publication date 2011
ISSN 1932-7447
Summary The double layer structure of two ionic liquids (ILs), 1-butyl-1- methylpyrrolidinium tris(pentafluoroethyl)trifluorophosphate ([Py 1,4]FAP) and 1-ethyl-3-methylimidazolium tris(pentafluoroethyl) trifluorophosphate ([EMIm]FAP) at the polarized Au(111) electrode interface is probed using Atomic Force Microscopy force measurements. The force-separation profiles suggest a multilayered morphology is present at the electrified Au(111)-IL interface, with more near surface layers detected at higher potentials. At the (slightly negative) open circuit potential, multiple ion layers are present, and the innermost layer, in contact with the Au(111) surface, is enriched in the cation due to electrostatic adsorption. Upon applying negative electrode potentials (-1.0 V, -2.0 V), stronger IL near surface structure is detected: both the number of ion layers and the force required to rupture these layers increases. Positive electrode potentials (+1.0 V, +2.0 V) also enhance IL near surface structure, but not as much as negative potentials, because surface-adsorbed anions are less effective at templating structure in subsequent layers than cations. This interfacial structure is not consistent with a double layer in the Stern-Gouy-Chapman sense, as there is no diffuse layer. The structure is consistent with a capicitative double-layer model, with a very small separation distance between the planes of charge.
Language eng
DOI 10.1021/jp200544b
Field of Research 091299 Materials Engineering not elsewhere classified
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2011, American Chemical Society.
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