Enhanced Photocatalytic Hydrogen Evolution by Star-Shaped Viologen-Sensitized TiO2 Nanoparticles

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dc.authoridYILDIZ, Gizem/0000-0001-9845-8076
dc.authoridKoyuncu, Sermet/0000-0001-8352-8326
dc.authoridAltinisik, Sinem/0000-0003-0238-0169
dc.authoridHatay Patir, Imren/0000-0003-2937-6557
dc.contributor.authorTurgut, Kubra
dc.contributor.authorAltinisik, Sinem
dc.contributor.authorYanalak, Gizem
dc.contributor.authorKoyuncu, Sermet
dc.contributor.authorHatay Patir, Imren
dc.date.accessioned2025-01-27T20:26:53Z
dc.date.available2025-01-27T20:26:53Z
dc.date.issued2023
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractViologens are well-suited for serving as electron-transfer mediators in redox systems due to their low reduction potential and ability to form stable radical cations. Because of this feature, viologens can play a key role in modifying semiconductors toward enhanced photocatalytic performance. Herein, a series of hybrid photocatalysts composed of TiO2 nanoparticles and star-shaped viologen derivatives with different alkyl chains [TPCBP-X_TiO2; X: ethyl (E), butyl (B), hexyl (H) and octyl (O)] were prepared for the photocatalytic hydrogen evolution from water under visible-light irradiation. The TPCBP-X molecules not only provide photosensitization of TiO2 nanoparticles in the visible-light region but also act as an efficient electron-transfer mediator for the transfer of photoinduced electrons to TiO2 and Pt. Among these photocatalysts, TPCBP-E_TiO2 exhibited a 1.013 mmol g(-1) h(-1) H-2 evolution rate with an apparent quantum yield (AQY) of 20.15% (470 nm), which dramatically improved hydrogen evolution activity among the other structures [TPCBP-X_TiO2 (X; B, H, O)] due to the more porous and uniform surface, resulting in its low barrier effect for electron transfer. In addition, in the presence of a Pt cocatalyst, TPCBP-E_TiO2 yielded a H-2 evolution rate of 17.7 mmol g(-1), which is about 2.2 times higher than that of pure TPCBP-E_TiO2 (8.1 mmol g(-1)) after 8 h of visible-light illumination.
dc.description.sponsorshipSelcuk University Scientific Research Foundation [23408002]
dc.description.sponsorshipThis research is supported by the Selcuk University Scientific Research Foundation with grant number 23408002.
dc.identifier.doi10.1021/acsanm.3c03965
dc.identifier.endpage20182
dc.identifier.issn2574-0970
dc.identifier.issue21
dc.identifier.scopus2-s2.0-85178035250
dc.identifier.scopusqualityQ1
dc.identifier.startpage20173
dc.identifier.urihttps://doi.org/10.1021/acsanm.3c03965
dc.identifier.urihttps://hdl.handle.net/20.500.12428/22480
dc.identifier.volume6
dc.identifier.wosWOS:001096698900001
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherAmer Chemical Soc
dc.relation.ispartofAcs Applied Nano Materials
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WoS_20250125
dc.subjectphotocatalysis
dc.subjectviologen
dc.subjecthydrogen evolution
dc.subjectsensitization of TiO2
dc.subjectelectron-transfermediator
dc.titleEnhanced Photocatalytic Hydrogen Evolution by Star-Shaped Viologen-Sensitized TiO2 Nanoparticles
dc.typeArticle

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