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Differential capacitance of the double layer at the electrode/ionic liquids interface

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dc.contributor.authorLockett, V.N.
dc.contributor.authorHorne, M.
dc.contributor.authorSedev, R.V.
dc.contributor.authorRodopoulos, T.
dc.contributor.authorRalston, J.
dc.date.issued2010
dc.description.abstractThe differential capacitance of the electrical double layer at glassy carbon, platinum and gold electrodes immersed in various ionic liquids was measured using impedance spectroscopy. We discuss the influence of temperature, the composition of the ionic liquids and the electrode material on the differential capacitance/potential curves. For different systems these curves have various overall shapes, but all include several extremes and a common minimum near the open circuit potential. We attribute this minimum to the potential of zero charge (PZC). Significantly, the differential capacitance generally decreases if the applied potential is large and moving away from the PZC. This is attributed to lattice saturation [A. A. Kornyshev, J. Phys. Chem. B, 2007, 111, 5545] effects which result in a thicker double layer. The differential capacitance of the double layer grows and specific adsorption diminishes with increasing temperature. Specific adsorption of both cations and anions influences the shapes of curves close to the PZC. The general shape of differential capacitance/potential does not depend strongly on the identity of the electrode material.
dc.identifier.citationPhysical Chemistry, Chemical Physics - PCCP, 2010; 12(39):12499-12512
dc.identifier.doi10.1039/C0CP00170H
dc.identifier.issn1463-9076
dc.identifier.issn1463-9084
dc.identifier.urihttps://hdl.handle.net/1959.8/116599
dc.language.isoen
dc.publisherRoyal Society of Chemistry
dc.rightsCopyright 2010 the Owner Societies
dc.source.urihttps://doi.org/10.1039/C0CP00170H
dc.subjectCarbon
dc.subjectGold
dc.subjectPlatinum
dc.subjectElectrodes
dc.subjectTemperature
dc.subjectElectric Capacitance
dc.subjectElectrochemistry
dc.subjectIonic Liquids
dc.subjectDielectric Spectroscopy
dc.titleDifferential capacitance of the double layer at the electrode/ionic liquids interface
dc.typeJournal article
pubs.publication-statusPublished
ror.mmsid9915910541101831

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