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dc.contributor.author
Rodenas, Pau
dc.contributor.author
Song, Taesup
dc.contributor.author
Sudhagar, Pitchaimuthu
dc.contributor.author
Marzari, Gabriela Lorena
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dc.contributor.author
Han, Hyungkyu
dc.contributor.author
Badia Bou, Laura
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Gimenez, Sixto
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Fabregat-Santiago, Francisco
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Mora Sero, Ivan
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Bisquert, Juan
dc.contributor.author
Paik, Ungyu
dc.contributor.author
Kang, Yong Soo
dc.date.available
2023-05-31T14:39:31Z
dc.date.issued
2013-02
dc.identifier.citation
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
dc.identifier.issn
1614-6840
dc.identifier.uri
http://hdl.handle.net/11336/199134
dc.description.abstract
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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Wiley-VCH
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
TiO2 hollow nanowires
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QDs sensitized photoanodes
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H2 generation
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CdS/CdSe quantum dots
dc.subject.classification
Físico-Química, Ciencia de los Polímeros, Electroquímica
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dc.subject.classification
Ciencias Químicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Quantum dot based heterostructures for unassisted photoelectrochemical hydrogen generation
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2023-05-30T11:57:35Z
dc.journal.volume
3
dc.journal.number
2
dc.journal.pagination
176-182
dc.journal.pais
Estados Unidos
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dc.description.fil
Fil: Rodenas, Pau. Hanyang University; Corea del Sur
dc.description.fil
Fil: Song, Taesup. Hanyang University; Corea del Sur
dc.description.fil
Fil: Sudhagar, Pitchaimuthu. Hanyang University; Corea del Sur
dc.description.fil
Fil: Marzari, Gabriela Lorena. Universitat Jaume I; España. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina
dc.description.fil
Fil: Han, Hyungkyu. Hanyang University; Corea del Sur
dc.description.fil
Fil: Badia Bou, Laura. Hanyang University; Corea del Sur
dc.description.fil
Fil: Gimenez, Sixto. Universitat Jaume I; España
dc.description.fil
Fil: Fabregat-Santiago, Francisco. Universitat Jaume I; España
dc.description.fil
Fil: Mora Sero, Ivan. Universitat Jaume I; España
dc.description.fil
Fil: Bisquert, Juan. Universitat Jaume I; España
dc.description.fil
Fil: Paik, Ungyu. Hanyang University; Corea del Sur
dc.description.fil
Fil: Kang, Yong Soo. Hanyang University; Corea del Sur
dc.journal.title
advanced energy materials
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1002/aenm.201200255
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