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dc.contributor.authorMoreno Garcia, Julian
dc.contributor.authorKhan, M. A.
dc.contributor.authorIvanov, Yurii P.
dc.contributor.authorLopatin, Sergei
dc.contributor.authorHolguin Lerma, Jorge Alberto
dc.contributor.authorMarinaro, Giovanni
dc.contributor.authorOoi, Boon S.
dc.contributor.authorIdriss, Hicham
dc.contributor.authorKosel, Jürgen
dc.date.accessioned2019-12-10T13:21:07Z
dc.date.available2019-12-10T13:21:07Z
dc.date.issued2019-10-10
dc.identifier.citationMoreno, J. A., Khan, M. A., Ivanov, Y. P., Lopatin, S., Holguín-Lerma, J. A., Marinaro, G., … Kosel, J. (2019). Growth of Ordered Iron Oxide Nanowires for Photo-electrochemical Water Oxidation. ACS Applied Energy Materials. doi:10.1021/acsaem.9b01343
dc.identifier.doi10.1021/acsaem.9b01343
dc.identifier.urihttp://hdl.handle.net/10754/660509
dc.description.abstractThis work reports the synthesis of ordered and vertically aligned iron oxide nanowires for photo-electrochemical (PEC) water oxidation. The nanowires exhibited promising PEC activity for water oxidation with saturated photocurrents of ∼0.8 mA cm-2 at 1.23 V vs RHE. Various factors inevitably affect their photochemical activity such as crystallinity, morphology, compositional gradient, and surface states. They were studied with HRTEM, EELS, and Raman shift techniques. The nanowires had complex compositional and morphological structures at nano and atomic scales. The nanowires annealed at 350 °C had an outer shell dominated by Fe3+ cations, while the core had mixed oxidation states of iron cations (+2 and +3). In contrast, nanowires annealed at 450 °C are fully oxidized with Fe3+ cations only and were found to be more active. At the same time, we observed anisotropic compositional gradients of nickel cations inside the iron oxide, originating from the nickel support film. Our work shows that the methodology used can affect the composition of the surface and near surface of the grown nanowires. It therefore points out the importance of a detailed analysis, in order to obtain a realistic structure-activity relationship in photo-electrocatalysis.
dc.description.sponsorshipThis publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No. OSR-2016-CRG5-2956.
dc.publisherAmerican Chemical Society (ACS)
dc.relation.urlhttps://pubs.acs.org/doi/10.1021/acsaem.9b01343
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Energy Materials, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acsaem.9b01343.
dc.titleGrowth of Ordered Iron Oxide Nanowires for Photo-electrochemical Water Oxidation
dc.typeArticle
dc.contributor.departmentPhysical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
dc.contributor.departmentSABIC Corporate Research and Development Center, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
dc.contributor.departmentElectron Microscopy
dc.contributor.departmentElectrical Engineering Program
dc.identifier.journalACS Applied Energy Materials
dc.rights.embargodate2020-10-10
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Materials Science & Metallurgy, University of Cambridge, Cambridge CB3 0FS, United Kingdom
kaust.personMoreno, Julián A.
kaust.personKhan, M. A.
kaust.personIvanov, Yurii P.
kaust.personLopatin, Sergei
kaust.personHolguin Lerma, Jorge Alberto
kaust.personMarinaro, Giovanni
kaust.personOoi, Boon S.
kaust.personIdriss, Hicham
kaust.personKosel, Jürgen
kaust.grant.numberOSR-2016-CRG5-2956
kaust.acknowledged.supportUnitOffice of Sponsored Research (OSR)
dc.date.published-online2019-10-10
dc.date.published-print2019-12-23


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