XPS enables visualization of electrode potential screening in an ionic liquid medium with temporal-and lateral-resolution

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buir.contributor.authorSüzer, Şefik
dc.citation.epage28440en_US
dc.citation.issueNumber41en_US
dc.citation.spage28434en_US
dc.citation.volumeNumber18en_US
dc.contributor.authorCamci, M. T.en_US
dc.contributor.authorAydogan, P.en_US
dc.contributor.authorUlgut, B.en_US
dc.contributor.authorKocabas, C.en_US
dc.contributor.authorSüzer, Şefiken_US
dc.date.accessioned2018-04-12T10:48:19Z
dc.date.available2018-04-12T10:48:19Z
dc.date.issued2016en_US
dc.departmentDepartment of Chemistryen_US
dc.departmentDepartment of Physicsen_US
dc.description.abstractWe present an X-ray photoelectron spectroscopic (XPS) investigation of potential screening across two gold electrodes fabricated on a porous polymer surface which is impregnated with the ionic liquid (IL) N-N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium bis(trifluoromethanesulfonyl)imide [DEME-TFSI]. The IL provides a sheet of conducting layers to the insulating polymer film, and allows monitoring charging and screening dynamics at the polymer + IL/vacuum interface in a laterally resolved fashion across the electrodes. Time-resolved measurements are also implemented by recording F1s peaks of the IL, while imposing 10 mHz square-wave (SQW) pulses across the two electrodes in a source-drain geometry. Variations in the F1s binding energy reflect directly the transient local electrical potential, and allow us to visualize screening of the otherwise built-in local voltage drop on and across the metal electrodes in the range of millimeters. Accordingly, the device is partitioned into two oppositely polarized regions, each following polarization of one electrode through the IL medium. On the other extreme, upon imposing relatively fast 1 kHz SQW pulses the charge screening is prevented and the device is brought to assume a simple resistor role. A simple equivalent circuit model also reproduces the observed voltage transients qualitatively. The presented structure and variants of XPS measurements, enabling us to record voltage transients in unexpectedly large lateral distances away from the electrodes, can impact the understanding of various electrochemical concepts.en_US
dc.identifier.doi10.1039/c6cp04933hen_US
dc.identifier.eissn1463-9084
dc.identifier.issn1463-9076
dc.identifier.urihttp://hdl.handle.net/11693/36682
dc.language.isoEnglishen_US
dc.publisherRoyal Society of Chemistryen_US
dc.relation.isversionofhttp://dx.doi.org/10.1039/c6cp04933hen_US
dc.source.titlePhysical Chemistry Chemical Physicsen_US
dc.titleXPS enables visualization of electrode potential screening in an ionic liquid medium with temporal-and lateral-resolutionen_US
dc.typeArticleen_US

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