The contrasting effect of the Ta/Nb ratio in (111)-layered B-site deficient hexagonal perovskite Ba5Nb4-xTaxO15 crystals on visible-light-induced photocatalytic water oxidation activity of their oxynitride derivatives

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dc.contributor.authorHojamberdiev, Mirabbos
dc.contributor.authorBekheet, Maged F.
dc.contributor.authorZahedi, Ehsan
dc.contributor.authorWagata, Hajime
dc.contributor.authorVequizo, Junie Jhon M.
dc.contributor.authorYamakata, Akira
dc.contributor.authorYubuta, Kunio
dc.contributor.authorGurlo, Aleksander
dc.contributor.authorDomen, Kazunari
dc.contributor.authorTeshima, Katsuya
dc.date.accessioned2017-10-24T06:17:09Z
dc.date.available2017-10-24T06:17:09Z
dc.date.issued2016
dc.descriptionDieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.de
dc.descriptionThis publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.en
dc.description.abstractThe effect of the Ta/Nb ratio in the (111)-layered B-site deficient hexagonal perovskite Ba5Nb4-xTaxO15 (0 <= x <= 4) crystals grown by a KCl flux method on visible-light-induced photocatalytic water oxidation activity of their oxynitride derivatives BaNb1-xTaxO2N (0 <= x <= 1) was investigated. The Rietveld refinement of X-ray data revealed that all Ba5Nb4-xTaxO15 samples were well crystallized in the space group P (3) over bar m1 (no. 164). Phase-pure BaNb1-xTaxO2N (0 <= x <= 1) porous structures were obtained by nitridation of the flux-grown oxide crystals at 950 degrees C for 20, 25, 30, 35, and 40 h, respectively. The absorption edge of BaNb1-xTaxO2N (0 <= x <= 1) was slightly shifted from 720 to 690 nm with the increasing Ta/Nb ratio. The O-2 evolution rate gradually progressed and reached the highest value (127.24 mu mol in the first 2 h) with the Ta content up to 50 mol% but decreased at 75 and 100 mol% presumably due to the reduced specific surface area and high density of structural defects, such as grain boundaries acting as recombination centers, originated from high-temperature nitridation for prolonged periods. Transient absorption spectroscopy provided evidence for the effect of the Ta/Nb ratio on the behavior and energy states of photogenerated charge carriers, indicating a direct correlation with photocatalytic water oxidation activity of BaNb1-xTaxO2N.en
dc.identifier.eissn1477-9234
dc.identifier.issn1477-9226
dc.identifier.pmid27437784
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/6878
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-6217
dc.language.isoen
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subject.ddc540 Chemie und zugeordnete Wissenschaftende
dc.titleThe contrasting effect of the Ta/Nb ratio in (111)-layered B-site deficient hexagonal perovskite Ba5Nb4-xTaxO15 crystals on visible-light-induced photocatalytic water oxidation activity of their oxynitride derivativesen
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.doi10.1039/c6dt02095j
dcterms.bibliographicCitation.issue31
dcterms.bibliographicCitation.journaltitleDalton transactionsen
dcterms.bibliographicCitation.originalpublishernameRoyal Society of Chemistryde
dcterms.bibliographicCitation.originalpublisherplaceCambridgede
dcterms.bibliographicCitation.pageend12568
dcterms.bibliographicCitation.pagestart12559
dcterms.bibliographicCitation.volume45
tub.accessrights.dnbdomain
tub.affiliationFak. 3 Prozesswissenschaften::Inst. Werkstoffwissenschaften und -technologien::FG Keramische Werkstoffede
tub.affiliation.facultyFak. 3 Prozesswissenschaftende
tub.affiliation.groupFG Keramische Werkstoffede
tub.affiliation.instituteInst. Werkstoffwissenschaften und -technologiende
tub.publisher.universityorinstitutionTechnische Universität Berlin

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