Synergistic effect of surface oxygen vacancies and hydroxyl groups on Cu-doped TiO2 photocatalyst for hydrogen evolution

The intricate nature of the titanium dioxide (TiO2) photocatalytic system, influenced by Cu doping, often yields conflicting outcomes. This study addresses this complexity by examining the impact of Cu ion doping in nanostructured TiO2 to augment its photocatalytic efficacy in hydrogen generation fr...

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Detalhes bibliográficos
Autores: Xing, Congcong, Yang, Linlin, Piveteau, Laura, Arbiol, Jordi, Llorca Piqué, Jordi|||0000-0002-7447-9582, Cabot, Andreu
Tipo de documento: artigo
Data de publicação:2023
País:España
Recursos:Universitat Politècnica de Catalunya (UPC)
Repositório:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglês
OAI Identifier:oai:upcommons.upc.edu:2117/402027
Acesso em linha:https://hdl.handle.net/2117/402027
https://dx.doi.org/10.1016/j.mtnano.2023.100435
Access Level:Acceso aberto
Palavra-chave:Catalysis
Hydrogen
Hidrogen
Catàlisi
Àrees temàtiques de la UPC::Enginyeria química
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spelling Synergistic effect of surface oxygen vacancies and hydroxyl groups on Cu-doped TiO2 photocatalyst for hydrogen evolutionXing, CongcongYang, LinlinPiveteau, LauraArbiol, JordiLlorca Piqué, Jordi|||0000-0002-7447-9582Cabot, AndreuCatalysisHydrogenHidrogenCatàlisiÀrees temàtiques de la UPC::Enginyeria químicaThe intricate nature of the titanium dioxide (TiO2) photocatalytic system, influenced by Cu doping, often yields conflicting outcomes. This study addresses this complexity by examining the impact of Cu ion doping in nanostructured TiO2 to augment its photocatalytic efficacy in hydrogen generation from ethanol-water mixtures. The improved performance is primarily attributed to the generation of oxygen vacancies (Ovac) within the TiO2 lattice. By adjusting the thermal processing parameters, the chemical state of Cu is modulated to optimize photocatalytic performance. Solid-state nuclear magnetic resonance (SSNMR) and density functional theory (DFT) calculations confirm that the presence of Ovac and hydroxyl groups (OH-) surface species not only facilitates local spatial charge separation but also enhances light absorption, thereby improving photocatalytic hydrogen evolution reaction (HER) rate up to 20.2 mmol h-1 g-1 under UV light. Furthermore, a proposed mechanism involves the participation of Ovac and OH- species, supported by Mott-Schottky (M - S) plots and ultraviolet photoelectron spectroscopy (UPS), revealing that Cu–TiO2 exhibits a lower flat band potential (Efb) and smaller work function compared to TiO2. This research underscores the pivotal role of Cu ions and Ovac:OH- in advancing the photocatalytic activity of TiO2-based crystals, imparting noteworthy implications for sustainable hydrogen generation.Peer ReviewedElsevier20232023-12-0120242024-02-15journal articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/vnd.openxmlformats-officedocument.wordprocessingml.documenthttps://hdl.handle.net/2117/402027https://dx.doi.org/10.1016/j.mtnano.2023.100435reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/4020272026-05-27T15:37:01Z
dc.title.none.fl_str_mv Synergistic effect of surface oxygen vacancies and hydroxyl groups on Cu-doped TiO2 photocatalyst for hydrogen evolution
title Synergistic effect of surface oxygen vacancies and hydroxyl groups on Cu-doped TiO2 photocatalyst for hydrogen evolution
spellingShingle Synergistic effect of surface oxygen vacancies and hydroxyl groups on Cu-doped TiO2 photocatalyst for hydrogen evolution
Xing, Congcong
Catalysis
Hydrogen
Hidrogen
Catàlisi
Àrees temàtiques de la UPC::Enginyeria química
title_short Synergistic effect of surface oxygen vacancies and hydroxyl groups on Cu-doped TiO2 photocatalyst for hydrogen evolution
title_full Synergistic effect of surface oxygen vacancies and hydroxyl groups on Cu-doped TiO2 photocatalyst for hydrogen evolution
title_fullStr Synergistic effect of surface oxygen vacancies and hydroxyl groups on Cu-doped TiO2 photocatalyst for hydrogen evolution
title_full_unstemmed Synergistic effect of surface oxygen vacancies and hydroxyl groups on Cu-doped TiO2 photocatalyst for hydrogen evolution
title_sort Synergistic effect of surface oxygen vacancies and hydroxyl groups on Cu-doped TiO2 photocatalyst for hydrogen evolution
dc.creator.none.fl_str_mv Xing, Congcong
Yang, Linlin
Piveteau, Laura
Arbiol, Jordi
Llorca Piqué, Jordi|||0000-0002-7447-9582
Cabot, Andreu
author Xing, Congcong
author_facet Xing, Congcong
Yang, Linlin
Piveteau, Laura
Arbiol, Jordi
Llorca Piqué, Jordi|||0000-0002-7447-9582
Cabot, Andreu
author_role author
author2 Yang, Linlin
Piveteau, Laura
Arbiol, Jordi
Llorca Piqué, Jordi|||0000-0002-7447-9582
Cabot, Andreu
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Catalysis
Hydrogen
Hidrogen
Catàlisi
Àrees temàtiques de la UPC::Enginyeria química
topic Catalysis
Hydrogen
Hidrogen
Catàlisi
Àrees temàtiques de la UPC::Enginyeria química
description The intricate nature of the titanium dioxide (TiO2) photocatalytic system, influenced by Cu doping, often yields conflicting outcomes. This study addresses this complexity by examining the impact of Cu ion doping in nanostructured TiO2 to augment its photocatalytic efficacy in hydrogen generation from ethanol-water mixtures. The improved performance is primarily attributed to the generation of oxygen vacancies (Ovac) within the TiO2 lattice. By adjusting the thermal processing parameters, the chemical state of Cu is modulated to optimize photocatalytic performance. Solid-state nuclear magnetic resonance (SSNMR) and density functional theory (DFT) calculations confirm that the presence of Ovac and hydroxyl groups (OH-) surface species not only facilitates local spatial charge separation but also enhances light absorption, thereby improving photocatalytic hydrogen evolution reaction (HER) rate up to 20.2 mmol h-1 g-1 under UV light. Furthermore, a proposed mechanism involves the participation of Ovac and OH- species, supported by Mott-Schottky (M - S) plots and ultraviolet photoelectron spectroscopy (UPS), revealing that Cu–TiO2 exhibits a lower flat band potential (Efb) and smaller work function compared to TiO2. This research underscores the pivotal role of Cu ions and Ovac:OH- in advancing the photocatalytic activity of TiO2-based crystals, imparting noteworthy implications for sustainable hydrogen generation.
publishDate 2023
dc.date.none.fl_str_mv 2023
2023-12-01
2024
2024-02-15
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
AM
http://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/402027
https://dx.doi.org/10.1016/j.mtnano.2023.100435
url https://hdl.handle.net/2117/402027
https://dx.doi.org/10.1016/j.mtnano.2023.100435
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/vnd.openxmlformats-officedocument.wordprocessingml.document
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,198674

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