Heterojunction synergies in titania-supported gold photocatalysts: implications for solar hydrogen production

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dc.contributor.author Jovic, Vedran en
dc.contributor.author Smith, Kevin en
dc.contributor.author Idriss, H en
dc.contributor.author Waterhouse, Geoffrey en
dc.date.accessioned 2017-07-20T00:37:59Z en
dc.date.issued 2015-08 en
dc.identifier.citation ChemSusChem 8(15):2551-2559 Aug 2015 en
dc.identifier.issn 1864-5631 en
dc.identifier.uri http://hdl.handle.net/2292/34368 en
dc.description.abstract The mixed-phase nature of P25 TiO2 (85 % anatase/15 % rutile) plays a key role in the high H2 production rates shown by Au/P25 TiO2 photocatalysts in alcohol/water systems. However, a full understanding of the synergistic charge transfer mechanisms between the TiO2 polymorphs that drive the high rates is yet to be realised. Here, we deconstruct P25 TiO2 into its component phases, functionalise the phases with Au nanoparticles and explore charge transfer in Au/TiO2 systems using EPR spectroscopy. EPR spectroscopy and photocatalytic data provide direct evidence that electrons excited across the rutile band gap move to anatase lattice traps through interfacial surface sites, which decreases electron-hole pair recombination and increases charge carrier availability for photoreactions. In particular, three-phase interfacial sites between Au, anatase and rutile appear to be H2 evolution "hot spots". The results isolate the origin of high photocatalytic H2 production rates seen in Au/P25 TiO2 systems. en
dc.format.medium Print-Electronic en
dc.language eng en
dc.publisher Wiley en
dc.relation.ispartofseries ChemSusChem en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.subject Hydrogen en
dc.subject Gold en
dc.subject Titanium en
dc.subject Ultraviolet Rays en
dc.subject Catalysis en
dc.subject Metal Nanoparticles en
dc.subject Photochemical Processes en
dc.title Heterojunction synergies in titania-supported gold photocatalysts: implications for solar hydrogen production en
dc.type Journal Article en
dc.identifier.doi 10.1002/cssc.201500126 en
pubs.issue 15 en
pubs.begin-page 2551 en
pubs.volume 8 en
dc.rights.holder Copyright: ChemPubSoc Europe en
dc.identifier.pmid 26105614 en
pubs.end-page 2559 en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 489448 en
pubs.org-id Science en
pubs.org-id Chemistry en
dc.identifier.eissn 1864-564X en
pubs.record-created-at-source-date 2017-07-20 en
pubs.dimensions-id 26105614 en

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