DC FieldValueLanguage
dc.contributor.authorCherevan, Alexey S.-
dc.contributor.authorGebhardt, Paul-
dc.contributor.authorKunzmann, Andreas-
dc.contributor.authorCosta, Ruben-
dc.contributor.authorEder, Dominik-
dc.date.accessioned2020-06-27T18:10:06Z-
dc.date.issued2018-
dc.identifier.issn2574-0962-
dc.identifier.urihttps://resolver.obvsg.at/urn:nbn:at:at-ubtuw:3-9651-
dc.identifier.urihttp://hdl.handle.net/20.500.12708/852-
dc.descriptionThe final publication is available via <a href="https://doi.org/10.1021/acsaem.8b00006" target="_blank">https://doi.org/10.1021/acsaem.8b00006</a>.-
dc.description.abstractNanostructuring constitutes a promising strategy to increase efficiency and stability of contemporary photocatalysts. Here we report on the synthesis of highly crystalline Ta2O5 nanotubes (NTs) by using carbon nanotubes (CNTs) as sacrificial hard templates and elucidate the role of residual Fe nanoparticles – often used as catalyst for the CNT growth – on their photocatalytic performance towards H2 evolution. We show that when using as grown CNTs, the resulting Ta2O5 NTs contained detectable amounts of Fe and possessed negligible photocatalytic activity. When CNTs were, however, purified from Fe by thermally annealing the CNTs at 2100°C, the same synthetic procedure yielded pure Ta2O5 NTs that showed a 40-fold increase in activity compared to the Fe-containing counterpart. A complementary set of analytical techniques in a combination with additional model experiments indicate that the detrimental effect of the residual Fe on the photocatalytic activity originate from atomic doping and formation of a segregated FeOx phase within the Ta2O5 matrix that can both act as efficient electron traps. Our result highlights that the presence of residual catalyst needs to be taken into account when using CNTs as hard templates and generally illustrates a possible effect of unintentional dopants that are often not considered in preparing functional nanostructures.en
dc.description.sponsorshipDeutsche Forschungsgesellschaft-
dc.languageEnglish-
dc.language.isoen-
dc.publisherAmerican Chemical Society-
dc.relation.ispartofACS Applied Energy Materials-
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/-
dc.subjectsol-gelen
dc.subjectcarbon nanotubesen
dc.subjectCVDen
dc.subjectphotocatalysisen
dc.subjectelectron trappingen
dc.subjectmetal dopingen
dc.subjectthermal annealingen
dc.titleBeware of doping: Ta2O5 nanotube photocatalyst using CNTs as hard templatesen
dc.typeArticleen
dc.typeArtikelde
dc.relation.grantnoDFG ED 221/3-1-
dc.rights.holder2018 American Chemical Society-
dc.type.categoryResearch Articleen
dc.type.categoryForschungsartikelde
tuw.versionam-
dcterms.isPartOf.titleACS Applied Energy Materials-
tuw.publication.orgunitE165 - Institut für Materialchemie-
tuw.publisher.doi10.1021/acsaem.8b00006-
dc.identifier.libraryidAC15624298-
dc.identifier.urnurn:nbn:at:at-ubtuw:3-9651-
dc.rights.identifierIn Copyright-
item.grantfulltextopen-
item.languageiso639-1en-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextwith Fulltext-
item.cerifentitytypePublications-
item.cerifentitytypePublications-
item.openairetypeArticle-
item.openairetypeArtikel-
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