Quantum dot based heterostructures for unassisted photoelectrochemical hydrogen generation

Autores: Rodenas, Pau; Song, Taesup; Sudhagar, Pitchaimuthu; Marzari, Gabriela Lorena; Han, Hyungkyu; Badia Bou, Laura; Gimenez, Sixto; Fabregat-Santiago, Francisco; Mora Sero, Ivan; Bisquert, Juan; Paik, Ungyu; Kang, Yong Soo
Año de publicación: 2013
Idioma: inglés
Tipo de recurso: artículo
Estado: versión publicada
Descripción: TiO 2 hollow nanowires (HNWs) and nanoparticles (NPs) constitute prom- ising architectures for QDs sensitized photoanodes for H 2 generation. We sensitize these structures with CdS/CdSe quantum dots by two different methods (chemical bath deposition, CBD and succesive ionic layer adsorp- tion and reaction, SILAR) and evaluate the performance of these photoelec- trodes. Remarkable photocurrents of 4 mA · cm and 8 mA · cm − 2 and hydrogen generation rates of 40 ml · cm − 2 · day − 1 and 80 ml · cm − 2 · day − 1 have been obtained in a three electrode conﬁ guration with sacriﬁ cial hole scavengers (Na 2 S and Na 2 SO 3 ), for HNWs and NPs respectively, which is conﬁ rmed through gas analysis. More importantly, autonomous generation of H 2 (20 ml · cm − 2 · day − 1 corresponding to 2 mA · cm − 2 photocurrent) is obtained in a two electrode conﬁ guration at short circuit under 100 mW · cm − 2 illumina- tion, clearly showing that these photoanodes can produce hydrogen without the assistance of any external bias. To the best of the authors? knowledge, this is the highest unbiased solar H 2 generation rate reported for these of QDs based heterostructures. Impedance spectroscopy measurements show similar electron density of trap states below the TiO 2 conduction band while the recombination resistance was higher for HNWs, consistently with the much lower surface area compared to NPs. However, the conductivity of both structures is similar, in spite of the one dimensional character of HNWs, which leaves some room for improvement of these nanowired structures. The effect of the QDs deposition method is also evaluated. Both structures show remarkable stability without any appreciable photocurrent loss after 0.5 hour of operation. The ﬁ ndings of this study constitute a relevant step towards the feasibility of hydrogen generation with wide bandgap semiconductors/ quantum dots based heterostructures.
Fil: Rodenas, Pau. Hanyang University; Corea del Sur
Fil: Song, Taesup. Hanyang University; Corea del Sur
Fil: Sudhagar, Pitchaimuthu. Hanyang University; Corea del Sur
Fil: Marzari, Gabriela Lorena. Universitat Jaume I; España. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina
Fil: Han, Hyungkyu. Hanyang University; Corea del Sur
Fil: Badia Bou, Laura. Hanyang University; Corea del Sur
Fil: Gimenez, Sixto. Universitat Jaume I; España
Fil: Fabregat-Santiago, Francisco. Universitat Jaume I; España
Fil: Mora Sero, Ivan. Universitat Jaume I; España
Fil: Bisquert, Juan. Universitat Jaume I; España
Fil: Paik, Ungyu. Hanyang University; Corea del Sur
Fil: Kang, Yong Soo. Hanyang University; Corea del Sur
Materia: TiO2 hollow nanowires
QDs sensitized photoanodes
H2 generation
CdS/CdSe quantum dots
Nivel de accesibilidad: acceso abierto
Condiciones de uso: https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
Institución: Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador: oai:ri.conicet.gov.ar:11336/199134

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spelling	Quantum dot based heterostructures for unassisted photoelectrochemical hydrogen generationRodenas, PauSong, TaesupSudhagar, PitchaimuthuMarzari, Gabriela LorenaHan, HyungkyuBadia Bou, LauraGimenez, SixtoFabregat-Santiago, FranciscoMora Sero, IvanBisquert, JuanPaik, UngyuKang, Yong SooTiO2 hollow nanowiresQDs sensitized photoanodesH2 generationCdS/CdSe quantum dotshttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1TiO 2 hollow nanowires (HNWs) and nanoparticles (NPs) constitute prom- ising architectures for QDs sensitized photoanodes for H 2 generation. We sensitize these structures with CdS/CdSe quantum dots by two different methods (chemical bath deposition, CBD and succesive ionic layer adsorp- tion and reaction, SILAR) and evaluate the performance of these photoelec- trodes. Remarkable photocurrents of 4 mA · cm and 8 mA · cm − 2 and hydrogen generation rates of 40 ml · cm − 2 · day − 1 and 80 ml · cm − 2 · day − 1 have been obtained in a three electrode conﬁ guration with sacriﬁ cial hole scavengers (Na 2 S and Na 2 SO 3 ), for HNWs and NPs respectively, which is conﬁ rmed through gas analysis. More importantly, autonomous generation of H 2 (20 ml · cm − 2 · day − 1 corresponding to 2 mA · cm − 2 photocurrent) is obtained in a two electrode conﬁ guration at short circuit under 100 mW · cm − 2 illumina- tion, clearly showing that these photoanodes can produce hydrogen without the assistance of any external bias. To the best of the authors? knowledge, this is the highest unbiased solar H 2 generation rate reported for these of QDs based heterostructures. Impedance spectroscopy measurements show similar electron density of trap states below the TiO 2 conduction band while the recombination resistance was higher for HNWs, consistently with the much lower surface area compared to NPs. However, the conductivity of both structures is similar, in spite of the one dimensional character of HNWs, which leaves some room for improvement of these nanowired structures. The effect of the QDs deposition method is also evaluated. Both structures show remarkable stability without any appreciable photocurrent loss after 0.5 hour of operation. The ﬁ ndings of this study constitute a relevant step towards the feasibility of hydrogen generation with wide bandgap semiconductors/ quantum dots based heterostructures.Fil: Rodenas, Pau. Hanyang University; Corea del SurFil: Song, Taesup. Hanyang University; Corea del SurFil: Sudhagar, Pitchaimuthu. Hanyang University; Corea del SurFil: Marzari, Gabriela Lorena. Universitat Jaume I; España. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Han, Hyungkyu. Hanyang University; Corea del SurFil: Badia Bou, Laura. Hanyang University; Corea del SurFil: Gimenez, Sixto. Universitat Jaume I; EspañaFil: Fabregat-Santiago, Francisco. Universitat Jaume I; EspañaFil: Mora Sero, Ivan. Universitat Jaume I; EspañaFil: Bisquert, Juan. Universitat Jaume I; EspañaFil: Paik, Ungyu. Hanyang University; Corea del SurFil: Kang, Yong Soo. Hanyang University; Corea del SurWiley-VCH2013-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/199134Rodenas, Pau; Song, Taesup; Sudhagar, Pitchaimuthu; Marzari, Gabriela Lorena; Han, Hyungkyu; et al.; Quantum dot based heterostructures for unassisted photoelectrochemical hydrogen generation; Wiley-VCH; advanced energy materials; 3; 2; 2-2013; 176-1821614-6840CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1002/aenm.201200255info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2026-03-31T15:04:51Zoai:ri.conicet.gov.ar:11336/199134instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982026-03-31 15:04:51.682CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv	Quantum dot based heterostructures for unassisted photoelectrochemical hydrogen generation
title	Quantum dot based heterostructures for unassisted photoelectrochemical hydrogen generation
spellingShingle	Quantum dot based heterostructures for unassisted photoelectrochemical hydrogen generation Rodenas, Pau TiO2 hollow nanowires QDs sensitized photoanodes H2 generation CdS/CdSe quantum dots
title_short	Quantum dot based heterostructures for unassisted photoelectrochemical hydrogen generation
title_full	Quantum dot based heterostructures for unassisted photoelectrochemical hydrogen generation
title_fullStr	Quantum dot based heterostructures for unassisted photoelectrochemical hydrogen generation
title_full_unstemmed	Quantum dot based heterostructures for unassisted photoelectrochemical hydrogen generation
title_sort	Quantum dot based heterostructures for unassisted photoelectrochemical hydrogen generation
dc.creator.none.fl_str_mv	Rodenas, Pau Song, Taesup Sudhagar, Pitchaimuthu Marzari, Gabriela Lorena Han, Hyungkyu Badia Bou, Laura Gimenez, Sixto Fabregat-Santiago, Francisco Mora Sero, Ivan Bisquert, Juan Paik, Ungyu Kang, Yong Soo
author	Rodenas, Pau
author_facet	Rodenas, Pau Song, Taesup Sudhagar, Pitchaimuthu Marzari, Gabriela Lorena Han, Hyungkyu Badia Bou, Laura Gimenez, Sixto Fabregat-Santiago, Francisco Mora Sero, Ivan Bisquert, Juan Paik, Ungyu Kang, Yong Soo
author_role	author
author2	Song, Taesup Sudhagar, Pitchaimuthu Marzari, Gabriela Lorena Han, Hyungkyu Badia Bou, Laura Gimenez, Sixto Fabregat-Santiago, Francisco Mora Sero, Ivan Bisquert, Juan Paik, Ungyu Kang, Yong Soo
author2_role	author author author author author author author author author author author
dc.subject.none.fl_str_mv	TiO2 hollow nanowires QDs sensitized photoanodes H2 generation CdS/CdSe quantum dots
topic	TiO2 hollow nanowires QDs sensitized photoanodes H2 generation CdS/CdSe quantum dots
purl_subject.fl_str_mv	https://purl.org/becyt/ford/1.4 https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv	TiO 2 hollow nanowires (HNWs) and nanoparticles (NPs) constitute prom- ising architectures for QDs sensitized photoanodes for H 2 generation. We sensitize these structures with CdS/CdSe quantum dots by two different methods (chemical bath deposition, CBD and succesive ionic layer adsorp- tion and reaction, SILAR) and evaluate the performance of these photoelec- trodes. Remarkable photocurrents of 4 mA · cm and 8 mA · cm − 2 and hydrogen generation rates of 40 ml · cm − 2 · day − 1 and 80 ml · cm − 2 · day − 1 have been obtained in a three electrode conﬁ guration with sacriﬁ cial hole scavengers (Na 2 S and Na 2 SO 3 ), for HNWs and NPs respectively, which is conﬁ rmed through gas analysis. More importantly, autonomous generation of H 2 (20 ml · cm − 2 · day − 1 corresponding to 2 mA · cm − 2 photocurrent) is obtained in a two electrode conﬁ guration at short circuit under 100 mW · cm − 2 illumina- tion, clearly showing that these photoanodes can produce hydrogen without the assistance of any external bias. To the best of the authors? knowledge, this is the highest unbiased solar H 2 generation rate reported for these of QDs based heterostructures. Impedance spectroscopy measurements show similar electron density of trap states below the TiO 2 conduction band while the recombination resistance was higher for HNWs, consistently with the much lower surface area compared to NPs. However, the conductivity of both structures is similar, in spite of the one dimensional character of HNWs, which leaves some room for improvement of these nanowired structures. The effect of the QDs deposition method is also evaluated. Both structures show remarkable stability without any appreciable photocurrent loss after 0.5 hour of operation. The ﬁ ndings of this study constitute a relevant step towards the feasibility of hydrogen generation with wide bandgap semiconductors/ quantum dots based heterostructures. Fil: Rodenas, Pau. Hanyang University; Corea del Sur Fil: Song, Taesup. Hanyang University; Corea del Sur Fil: Sudhagar, Pitchaimuthu. Hanyang University; Corea del Sur Fil: Marzari, Gabriela Lorena. Universitat Jaume I; España. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina Fil: Han, Hyungkyu. Hanyang University; Corea del Sur Fil: Badia Bou, Laura. Hanyang University; Corea del Sur Fil: Gimenez, Sixto. Universitat Jaume I; España Fil: Fabregat-Santiago, Francisco. Universitat Jaume I; España Fil: Mora Sero, Ivan. Universitat Jaume I; España Fil: Bisquert, Juan. Universitat Jaume I; España Fil: Paik, Ungyu. Hanyang University; Corea del Sur Fil: Kang, Yong Soo. Hanyang University; Corea del Sur
description	TiO 2 hollow nanowires (HNWs) and nanoparticles (NPs) constitute prom- ising architectures for QDs sensitized photoanodes for H 2 generation. We sensitize these structures with CdS/CdSe quantum dots by two different methods (chemical bath deposition, CBD and succesive ionic layer adsorp- tion and reaction, SILAR) and evaluate the performance of these photoelec- trodes. Remarkable photocurrents of 4 mA · cm and 8 mA · cm − 2 and hydrogen generation rates of 40 ml · cm − 2 · day − 1 and 80 ml · cm − 2 · day − 1 have been obtained in a three electrode conﬁ guration with sacriﬁ cial hole scavengers (Na 2 S and Na 2 SO 3 ), for HNWs and NPs respectively, which is conﬁ rmed through gas analysis. More importantly, autonomous generation of H 2 (20 ml · cm − 2 · day − 1 corresponding to 2 mA · cm − 2 photocurrent) is obtained in a two electrode conﬁ guration at short circuit under 100 mW · cm − 2 illumina- tion, clearly showing that these photoanodes can produce hydrogen without the assistance of any external bias. To the best of the authors? knowledge, this is the highest unbiased solar H 2 generation rate reported for these of QDs based heterostructures. Impedance spectroscopy measurements show similar electron density of trap states below the TiO 2 conduction band while the recombination resistance was higher for HNWs, consistently with the much lower surface area compared to NPs. However, the conductivity of both structures is similar, in spite of the one dimensional character of HNWs, which leaves some room for improvement of these nanowired structures. The effect of the QDs deposition method is also evaluated. Both structures show remarkable stability without any appreciable photocurrent loss after 0.5 hour of operation. The ﬁ ndings of this study constitute a relevant step towards the feasibility of hydrogen generation with wide bandgap semiconductors/ quantum dots based heterostructures.
publishDate	2013
dc.date.none.fl_str_mv	2013-02
dc.type.none.fl_str_mv	info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo
format	article
status_str	publishedVersion
dc.identifier.none.fl_str_mv	http://hdl.handle.net/11336/199134 Rodenas, Pau; Song, Taesup; Sudhagar, Pitchaimuthu; Marzari, Gabriela Lorena; Han, Hyungkyu; et al.; Quantum dot based heterostructures for unassisted photoelectrochemical hydrogen generation; Wiley-VCH; advanced energy materials; 3; 2; 2-2013; 176-182 1614-6840 CONICET Digital CONICET
url	http://hdl.handle.net/11336/199134
identifier_str_mv	Rodenas, Pau; Song, Taesup; Sudhagar, Pitchaimuthu; Marzari, Gabriela Lorena; Han, Hyungkyu; et al.; Quantum dot based heterostructures for unassisted photoelectrochemical hydrogen generation; Wiley-VCH; advanced energy materials; 3; 2; 2-2013; 176-182 1614-6840 CONICET Digital CONICET
dc.language.none.fl_str_mv	eng
language	eng
dc.relation.none.fl_str_mv	info:eu-repo/semantics/altIdentifier/doi/10.1002/aenm.201200255
dc.rights.none.fl_str_mv	info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv	openAccess
rights_invalid_str_mv	https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv	application/pdf application/pdf
dc.publisher.none.fl_str_mv	Wiley-VCH
publisher.none.fl_str_mv	Wiley-VCH
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reponame_str	CONICET Digital (CONICET)
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repository.name.fl_str_mv	CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv	dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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Quantum dot based heterostructures for unassisted photoelectrochemical hydrogen generation

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