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dc.contributor.authorWalker, Michaelen
dc.contributor.authorUbych, Ken
dc.contributor.authorSaraswat, Ven
dc.contributor.authorChalklen, EAen
dc.contributor.authorBraeuninger-Weimer, Philippen
dc.contributor.authorCaneva, Sen
dc.contributor.authorWeatherup, Roberten
dc.contributor.authorHofmann, Stephanen
dc.contributor.authorKeyser, Ulrichen
dc.date.accessioned2017-04-19T12:05:50Z
dc.date.available2017-04-19T12:05:50Z
dc.date.issued2017-02-28en
dc.identifier.issn1936-0851
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/263692
dc.description.abstractFrom a systematic study of the concentration driven diffusion of positive and negative ions across porous 2D membranes of graphene and hexagonal boron nitride (h-BN), we prove their cation selectivity. Using the current−voltage characteristics of graphene and h-BN monolayers separating reservoirs of different salt concentrations, we calculate the reversal potential as a measure of selectivity. We tune the Debye screening length by exchanging the salt concentrations and demonstrate that negative surface charge gives rise to cation selectivity. Surprisingly, h-BN and graphene membranes show similar characteristics, strongly suggesting a common origin of selectivity in aqueous solvents. For the first time, we demonstrate that the cation flux can be increased by using ozone to create additional pores in graphene while maintaining excellent selectivity. We discuss opportunities to exploit our scalable method to use 2D membranes for applications including osmotic power conversion.
dc.description.sponsorshipThis work was supported by the EPSRC Cambridge NanoDTC, EP/G037221/1, and EPSRC grant GRAPHTED, EP/K016636/1. R.S.W. acknowledges a Research Fellowship from St. John’s College, Cambridge, and a Marie SkłodowskaCurie Individual Fellowship (Global) under Grant ARTIST (No. 656870) from the European Union’s Horizon 2020 research and innovation programme. V.S. acknowledges funding from the Commonwealth Scholarship Commission in the UK. S.C. acknowledges funding from EPSRC (doctoral training award). U.F.K. was partly supported by an ERC consolidator grant DesignerPores 647144.
dc.languageengen
dc.language.isoenen
dc.publisherAmerican Chemical Society
dc.rightsAttribution 4.0 Internationalen
dc.rightsAttribution 4.0 Internationalen
dc.rightsAttribution 4.0 Internationalen
dc.rightsAttribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectcharge selectiveen
dc.subjectdefectsen
dc.subjectgrapheneen
dc.subjecthexagonal boron nitrideen
dc.subjectporous 2D materialsen
dc.titleExtrinsic Cation Selectivity of 2D Membranesen
dc.typeArticle
prism.endingPage1346
prism.issueIdentifier2en
prism.publicationDate2017en
prism.publicationNameACS Nanoen
prism.startingPage1340
prism.volume11en
dc.identifier.doi10.17863/CAM.9055
dcterms.dateAccepted2017-02-03en
rioxxterms.versionofrecord10.1021/acsnano.6b06034en
rioxxterms.versionVoRen
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/en
rioxxterms.licenseref.startdate2017-02-28en
dc.contributor.orcidWalker, Michael [0000-0002-1182-5652]
dc.contributor.orcidBraeuninger-Weimer, Philipp [0000-0001-8677-1647]
dc.contributor.orcidWeatherup, Robert [0000-0002-3993-9045]
dc.contributor.orcidHofmann, Stephan [0000-0001-6375-1459]
dc.contributor.orcidKeyser, Ulrich [0000-0003-3188-5414]
dc.identifier.eissn1936-086X
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idEuropean Commission Horizon 2020 (H2020) Marie Sk?odowska-Curie actions (656870)
pubs.funder-project-idEPSRC (EP/K016636/1)
pubs.funder-project-idEPSRC (EP/G037221/1)
pubs.funder-project-idECH2020 EUROPEAN RESEARCH COUNCIL (ERC) (647144)
cam.issuedOnline2017-02-03en
cam.orpheus.successThu Jan 30 12:54:01 GMT 2020 - The item has an open VoR version.*
rioxxterms.freetoread.startdate2100-01-01


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Attribution 4.0 International
Except where otherwise noted, this item's licence is described as Attribution 4.0 International