Pseudocapacitive charge storage at nanoscale silicon electrodes

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dc.contributor.authorMcSweeney, William
dc.contributor.authorGeaney, Hugh
dc.contributor.authorGlynn, Colm
dc.contributor.authorMcNulty, David
dc.contributor.authorO'Dwyer, Colm
dc.contributor.funderHigher Education Authorityen
dc.contributor.funderIrish Research Councilen
dc.contributor.funderSeventh Framework Programmeen
dc.contributor.funderScience Foundation Irelanden
dc.date.accessioned2018-07-16T15:47:26Z
dc.date.available2018-07-16T15:47:26Z
dc.date.issued2015-05
dc.date.updated2018-06-11T21:24:00Z
dc.description.abstractPseudocapacitive behaviour can be accessed when Si nanowire (NW) electrodes are scanned at relatively fast potential scan rates in Li-ion battery electrolytes. Measurements using cyclic voltammetry supported by electron microscopy confirm that Si NWs formed on silicon substrates, as opposed to metallic current collectors, do not solely undergo alloying reactions. The influence of doping type, carrier concentration and bias condition during voltammetric polarization significantly alters the mechanism of electrochemical energy storage. The formation of a carrier depleted (electrically dead) layer of n-type NWs on silicon current collector electrodes limits insertion or alloying processes and rates that ordinarily form Li-Si phases, and charge is also stored within the electric double layer via pseudocapacitive processes. P-type NWs with solid crystalline cores also exhibit pseudocapacitive charge storage without structural modification of the NWs.en
dc.description.sponsorshipHigher Education Authority (under the framework of the INSPIRE programme, funded by the Irish Government's Programme for Research in Third Level Institutions, Cycle 4, National Development Plan 2007-2013); Irish Research Council (Award No. RS/2011/797);en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationMcSweeney, W., Geaney, H., Glynn, C., McNulty, D. and O'Dwyer, C. (2015) 'Pseudocapacitive Charge Storage at Nanoscale Silicon Electrodes', ECS Transactions, 66(6), pp. 39-48. doi: 10.1149/06606.0039ecsten
dc.identifier.doi10.1149/06606.0039ecst
dc.identifier.endpage48en
dc.identifier.issn1938-5862
dc.identifier.issued6en
dc.identifier.journaltitleECS Transactionsen
dc.identifier.startpage39en
dc.identifier.urihttps://hdl.handle.net/10468/6461
dc.identifier.volume66en
dc.language.isoenen
dc.publisherElectrochemical Societyen
dc.relation.projectinfo:eu-repo/grantAgreement/EC/FP7::SP1::NMP/314508/EU/STable high-capacity lithium-Air Batteries with Long cycle life for Electric cars/STABLEen
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Technology and Innovation Development Award (TIDA)/13/TIDA/E2761/IE/LiONSKIN - Moldable Li-ion battery outer skin for electronic devices/en
dc.relation.urihttp://ecst.ecsdl.org/content/66/6/39.abstract
dc.rights© 2015 ECS - The Electrochemical Societyen
dc.subjectSiliconen
dc.subjectElectric double layeren
dc.subjectElectrochemical energy storageen
dc.subjectLi-ion battery electrolytesen
dc.subjectPotential scan ratesen
dc.subjectSilicon electrodeen
dc.subjectSilicon substratesen
dc.subjectSolid crystallineen
dc.subjectStructural modificationsen
dc.subjectAlloyingen
dc.subjectCarrier concentrationen
dc.subjectCyclic voltammetryen
dc.subjectElectric current collectorsen
dc.subjectElectrodesen
dc.subjectLithium-ion batteriesen
dc.subjectNanowiresen
dc.subjectSemiconductor dopingen
dc.titlePseudocapacitive charge storage at nanoscale silicon electrodesen
dc.typeArticle (peer-reviewed)en
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