Sensitization of Nanocrystalline TiO2 with Multibranched Organic Dyes and Co(III)/(II) Mediators: Strategies to Improve Charge Collection Efficiency (Articolo in rivista)

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  • Sensitization of Nanocrystalline TiO2 with Multibranched Organic Dyes and Co(III)/(II) Mediators: Strategies to Improve Charge Collection Efficiency (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1021/jp4067586 (literal)
Alternative label
  • Mba, Miriam and D'Acunzo, Marco and Salice, Patrizio and Carofiglio, Tommaso and Maggini, Michele and Caramori, Stefano and Campana, Alessandra and Aliprandi, Alessandro and Argazzi, Roberto and Carli, Stefano and Bignozzi, Carlo A. (2013)
    Sensitization of Nanocrystalline TiO2 with Multibranched Organic Dyes and Co(III)/(II) Mediators: Strategies to Improve Charge Collection Efficiency
    in Journal of physical chemistry. C; ACS, American chemical society, Washington, DC (Stati Uniti d'America)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Mba, Miriam and D'Acunzo, Marco and Salice, Patrizio and Carofiglio, Tommaso and Maggini, Michele and Caramori, Stefano and Campana, Alessandra and Aliprandi, Alessandro and Argazzi, Roberto and Carli, Stefano and Bignozzi, Carlo A. (literal)
Pagina inizio
  • 19885 (literal)
Pagina fine
  • 19896 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 117 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 12 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 39 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Bignozzi, CA (Reprint Author), Univ Ferrara, Dipartimento Sci Chim & Farmaceut, Via Borsari 46, I-44121 Ferrara, Italy. Mba, Miriam; D'Acunzo, Marco; Salice, Patrizio; Carofiglio, Tommaso; Maggini, Michele, Univ Padua, Dipartimento Sci Chim, I-35131 Padua, Italy. Mba, Miriam; D'Acunzo, Marco; Salice, Patrizio; Carofiglio, Tommaso; Maggini, Michele, Univ Padua, ITM CNR, I-35131 Padua, Italy. Caramori, Stefano; Aliprandi, Alessandro; Carli, Stefano; Bignozzi, Carlo A., Univ Ferrara, Dipartimento Sci Chim & Farmaceut, I-44121 Ferrara, Italy. Campana, Alessandra, Univ Bologna, Dipartimento Chim G Ciamician, I-40127 Bologna, Italy. Argazzi, Roberto, Univ Ferrara, Dipartimento Sci Chim & Farmaceut, CNR ISOF, I-44121 Ferrara, Italy. (literal)
Titolo
  • Sensitization of Nanocrystalline TiO2 with Multibranched Organic Dyes and Co(III)/(II) Mediators: Strategies to Improve Charge Collection Efficiency (literal)
Abstract
  • The photoelectrochemical properties of thiophene-triphenylamine (TTPA) sensitizers (TTPA1-3) used in association with different cobalt based mediators, including kinetically fast shuttles such as [Co(bpy)(3)](3+/2+) and [Co(phen)(3)](3+/2+) and sterically hindered couples like [Co(dtb)(3)](3+/2+) were studied by combining molecular, modeling, spectroscopic, and photoelectrochemical techniques. The results indicate that the presence of multiple anchoring points on the dye structure improves its adsorption stability onto TiO2 but induces a pseudoplanar adsorption geometry which is not suited to insulate properly the surface of the semiconductor and of the back contact, against electron recombination; particularly when kinetically fast shuttles are employed. This drawback could be successfully countered by exploiting both a compact blocking underlayer and the chemisorption of octyl triethoxysilane (Si-C8) acting as a molecular barrier onto the TiO2 surface, thus limiting the access of the oxidized mediator to the exposed titania sites. These treatments improve the electron collection efficiency up to 80-90% with the I-/I-3(-) couple and up to 70% when the [Co(dtb)(3)](3+)/(2+) mediator was used. (literal)
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