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dc.contributor.authorLi, Weiwei
dc.contributor.authorJiang, K
dc.contributor.authorLi, Z
dc.contributor.authorGong, S
dc.contributor.authorHoye, Robert
dc.contributor.authorHu, Z
dc.contributor.authorSong, Y
dc.contributor.authorTian, C
dc.contributor.authorKim, J
dc.contributor.authorZhang, KHL
dc.contributor.authorCho, S
dc.contributor.authorMacManus-Driscoll, JL
dc.date.accessioned2018-11-14T00:31:53Z
dc.date.available2018-11-14T00:31:53Z
dc.date.issued2018-11-05
dc.identifier.issn1614-6832
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/285066
dc.description.abstractOwing to the versatility in their chemical and physical properties, transition metal perovskite oxides have emerged as a new category of highly efficient photocatalysts for photoelectrochemical water splitting. Here, to understand the underlying mechanism for the enhanced photoelectrochemical water splitting in mixed perovskites, we explore ideal epitaxial thin films of the BiFeO3-SrTiO3 system. The electronic struture and carrier dynamics are determined from both experiment and density-functional theory calculations. The intrinsic phenomena are measured in this ideal sytem, contrasting to commonly studied polycrstalline solid solutions where extrinsic structural features obscure the intrinsic phenomena. We determined that when SrTiO3 is added to BiFeO3 the conduction band minimum position is raised and an exponential tail of trap states from hybridized Ti 3d and Fe 3d orbitals emerges near the conduction band edge. The presence of these trap states strongly suppresses the fast electron-hole recombination and improves the photocurrent density in the visible-light region, up to 16 times at 0 VRHE compared to the pure end member compositions. Our work provides a new design approach for optimising the photoelectrochemical performance in mixed perovksite oxides.
dc.publisherWiley
dc.rightsAttribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleOrigin of Improved Photoelectrochemical Water Splitting in Mixed Perovskite Oxides
dc.typeArticle
prism.issueIdentifier31
prism.publicationDate2018
prism.publicationNameAdvanced Energy Materials
prism.volume8
dc.identifier.doi10.17863/CAM.32436
dcterms.dateAccepted2018-08-29
rioxxterms.versionofrecord10.1002/aenm.201801972
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2018-11-05
dc.contributor.orcidLi, Weiwei [0000-0001-5781-5401]
dc.contributor.orcidHoye, Robert [0000-0002-7675-0065]
dc.identifier.eissn1614-6840
dc.publisher.urlhttp://dx.doi.org/10.1002/aenm.201801972
rioxxterms.typeJournal Article/Review
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/N004272/1)
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/L011700/1)
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/H047867/1)
cam.issuedOnline2018-09-24


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