Modification of 1D TiO2 nanowires with GaOxNy by atomic layer deposition for TiO2@GaOxNy core-shell nanowires with enhanced photoelectrochemical performance

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dc.check.date2021-02-24
dc.check.infoAccess to this article is restricted until 12 months after publication by request of the publisher.en
dc.contributor.authorTao, Jiajia
dc.contributor.authorMa, Hong-Ping
dc.contributor.authorYuan, Kaiping
dc.contributor.authorGu, Yang
dc.contributor.authorLian, Jianwei
dc.contributor.authorLi, Xiao-Xi
dc.contributor.authorHuang, Wei
dc.contributor.authorNolan, Michael
dc.contributor.authorLu, Hong-Liang
dc.contributor.authorZhang, David Wei
dc.contributor.funderNational Natural Science Foundation of Chinaen
dc.contributor.funderNatural Science Foundation of Shanghaien
dc.contributor.funderChina Postdoctoral Science Foundationen
dc.contributor.funderFudan Universityen
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderHigher Education Authorityen
dc.contributor.funderDepartment of Education and Skillsen
dc.date.accessioned2020-02-27T12:50:09Z
dc.date.available2020-02-27T12:50:09Z
dc.date.issued2020-02-24
dc.date.updated2020-02-27T12:36:13Z
dc.description.abstractAs a well-known semiconductor that can catalyse the oxygen evolution reaction, TiO2 has been extensively investigated for its solar photoelectrochemical water properties. Unmodified TiO2 shows some issues, particularly with respect to its photoelectrochemical performance. In this paper, we present a strategy for the controlled deposition of controlled amounts of GaOxNy cocatalysts on TiO2 1D nanowires (TiO2@GaOxNy core-shell) using atomic layer deposition. We show that this modification significantly enhances the photoelectrochemical performance compared to pure TiO2 NW photoanodes. For our most active TiO2@GaOxNy core-shell nanowires with a GaOxNy thickness of 20 nm, a photocurrent density up to 1.10 mA cm-2 (at 1.23 V vs RHE) under AM 1.5 G irradiation (100 mW cm-2) has been achieved, which is 14 times higher than that of unmodified TiO2 NWs. Furthermore, the band gap matching with TiO2 enhances absorption of visible light over unmodified TiO2 and the facile oxygen vacancy formation after deposition of GaOxNy also provides active sites for water activation. Density functional theory studies of model systems of GaOxNy-modified TiO2 confirm the band gap reduction, high reducibility and ability to activate water. The highly efficient and stable systems of TiO2@GaOxNy core-shell nanowires with ALD deposited GaOxNy demonstrates a good strategy for fabrication of core-shell structures that enhances the photoelectrochemical performance of readily available photoanodes.en
dc.description.sponsorshipNational Natural Science Foundation of China ((No. U1632121, 11804055, 51861135105 and 61874034); National Key R&D Program of China (No.2016YFE0110700)); National Natural Science Foundation of China Natural Science Foundation of Shanghai (No. 18ZR1405000); China Postdoctoral Science Foundation (No. 2018M631997); Fudan University (Fudan University Exchange Program Scholarship for Doctoral Students); (Tyndall Institute is supported Science Foundation Ireland ( SFI-NSF China Partnership Program, Grant Number SFI 17/NSFC/5279 NITRALD); Science Foundation Ireland, Higher Education Authority, Department of Education and Skillls (resources at Tyndall supported by SFI and access to the SFI/DES/HEA funded Irish Center for High End Computing)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationTao, J., Ma, H.-P., Yuan, K., Gu, Y., Lian, J., Li, X.-X., Huang, W., Nolan, M., Lu, H.-L. and Zhang, D. W. (2020) 'Modification of 1D TiO2 nanowires with GaOxNy by atomic layer deposition for TiO2@GaOxNy core-shell nanowires with enhanced photoelectrochemical performance', Nanoscale, doi: 10.1039/C9NR10908Ken
dc.identifier.doi10.1039/C9NR10908Ken
dc.identifier.endpage52en
dc.identifier.issn2040-3364
dc.identifier.journaltitleNanoscaleen
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/9707
dc.language.isoenen
dc.publisherRoyal Society of Chemistryen
dc.relation.urihttps://pubs.rsc.org/en/content/articlelanding/2020/nr/c9nr10908k#!divAbstract
dc.rights© Royal Society of Chemistry 2020en
dc.subjectTiO2@GaOxNy nanowiresen
dc.subjectCore-shell nanoarchitectureen
dc.subjectPhotoelectrochemical performanceen
dc.subjectAtomic layer depositionen
dc.subjectNanowiresen
dc.subjectTiO2en
dc.titleModification of 1D TiO2 nanowires with GaOxNy by atomic layer deposition for TiO2@GaOxNy core-shell nanowires with enhanced photoelectrochemical performanceen
dc.typeArticle (peer-reviewed)en
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