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Nickel oxide selectively deposited on the {101} facet of anatase TiO2 nanocrystal bipyramids for enhanced photocatalysis

hal.structure.identifierInstitut des Sciences Moléculaires [ISM]
hal.structure.identifierFachbereich Material- und Geowissenshaften
dc.contributor.authorKASHIWAYA, Shun
hal.structure.identifierInstitut des Sciences Moléculaires [ISM]
dc.contributor.authorOLIVIER, Céline
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorMAJIMEL, Jérôme
hal.structure.identifierFachbereich Material- und Geowissenshaften
dc.contributor.authorKLEIN, Andreas
hal.structure.identifierFachbereich Material- und Geowissenshaften
dc.contributor.authorJAEGERMANN, Wolfram
hal.structure.identifierInstitut des Sciences Moléculaires [ISM]
dc.contributor.authorTOUPANCE, Thierry
dc.date.issued2019
dc.identifier.issn2574-0970
dc.description.abstractEnFacet-engineered anatase TiO2 with NiO nanoparticles heterocontacts were successfully prepared by selective photodeposition of NiO nanoparticles onto the {101} facet of the top-truncated bipyramidal TiO2 anatase nanocrystals coexposed with {001} and {101} facets. The morphology and electronic properties of the resulting 0.1–10 wt % NiO-decorated TiO2 were investigated by X-ray diffraction, high-resolution electron microscopy, N2 sorption analysis, and UV–vis spectroscopy. Furthermore, a careful determination of the energy band alignment diagram was conducted by a model experiment using XPS and UPS to verify charge separation at the interface of the NiO−TiO2 heterostructure. The model experiment was performed by stepwise deposition of NiO onto oriented TiO2 substrates and in-situ photoelectron spectroscopy measurements without breaking vacuum. Core levels showed shifts of 0.58 eV toward lower binding energies, meaning an upward band bending in TiO2 at the NiO–TiO2 interface. Furthermore, 0.1 wt % NiO–TiO2 exhibited 50% higher activities than the pure TiO2 for methylene blue (MB) photodecomposition under UV irradiation. This enhanced photocatalytic activity of NiO–TiO2 nanocomposites was related to the internal electric field developed at the p–n NiO−TiO2 heterojunction, leading to vectorial charge separation. Finally, mechanistic studies conducted in the presence of carrier or radical scavengers revealed that holes dominantly contributed to the photocatalytic reactions in the case of NiO–TiO2 photocatalysts while electrons played the main role in photocatalysis for the pure TiO2 materials.
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.subject.enFacet-engineered NiO−anatase TiO2 materials
dc.subject.enInterface experiments
dc.subject.enBand alignment diagrams
dc.subject.enPhotocatalysis
dc.subject.enOrganic dyes
dc.title.enNickel oxide selectively deposited on the {101} facet of anatase TiO2 nanocrystal bipyramids for enhanced photocatalysis
dc.typeArticle de revue
dc.identifier.doi10.1021/acsanm.9b00729
dc.subject.halChimie/Matériaux
bordeaux.journalACS Applied Nano Materials
bordeaux.page4793-4803
bordeaux.volume2
bordeaux.issue8
bordeaux.peerReviewedoui
hal.identifierhal-03060262
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03060262v1
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