http://www.cnr.it/ontology/cnr/individuo/prodotto/ID272275

Comparative Evaluation of Catalytic Counter Electrodes for Co(III)/(II) Electron Shuttles in Regenerative Photoelectrochemical Cells (Articolo in rivista)

Type

Prodotto della ricerca (Classe)
Articolo in rivista (Classe)

Label

Comparative Evaluation of Catalytic Counter Electrodes for Co(III)/(II) Electron Shuttles in Regenerative Photoelectrochemical Cells (Articolo in rivista) (literal)

Anno

2013-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1021/jp312066n (literal)

Alternative label

Carli, Stefano and Busatto, Eva and Caramori, Stefano and Boaretto, Rita and Argazzi, Roberto and Timpson, Cliff. J. and Bignozzi, Carlo Alberto (2013)
Comparative Evaluation of Catalytic Counter Electrodes for Co(III)/(II) Electron Shuttles in Regenerative Photoelectrochemical Cells
in Journal of physical chemistry. C; American Chemical Society, Washington, DC (Stati Uniti d'America)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Carli, Stefano and Busatto, Eva and Caramori, Stefano and Boaretto, Rita and Argazzi, Roberto and Timpson, Cliff. J. and Bignozzi, Carlo Alberto (literal)

Pagina inizio

5142 (literal)

Pagina fine

5153 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

117 (literal)

Rivista

Journal of physical chemistry. C (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

12 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

10 (literal)

Note

ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

Bignozzi, CA (Reprint Author), Univ Ferrara, Dipartimento Chim, Via Luigi Borsari 46, I-44121 Ferrara, Italy. Carli, Stefano; Busatto, Eva; Caramori, Stefano; Boaretto, Rita; Bignozzi, Carlo Alberto, Univ Ferrara, Dipartimento Chim, I-44121 Ferrara, Italy. Argazzi, Roberto, Univ Ferrara, Dipartimento Chim, CNR ISOF, I-44121 Ferrara, Italy. Timpson, Cliff. J., Roger Williams Univ, Dept Chem & Phys, Bristol, RI 02809 USA. (literal)

Titolo

Comparative Evaluation of Catalytic Counter Electrodes for Co(III)/(II) Electron Shuttles in Regenerative Photoelectrochemical Cells (literal)

Abstract

Different PEDOT-based counter electrodes, obtained by potentiostatic electropolymerization of 3,4-ethylenedioxythiophene (EDOT) monomer on fluorine tin oxide (FTO) surfaces, were compared to platinum- and gold-coated electrodes in order to evaluate the potential use of PEDOT counter electrodes in dye-sensitized photoelectrochemical cells (DSCs). In particular, a series of DSC devices utilizing Co(III)/(II) polypyridine redox mediators ([Co(bpy)(3)](3+/2+), [Co(phen)(3)](3+/2+), [Co(dtb)(3)](3+/2+); bpy = 2,2'-bipyridine; dtb = 4,4'ditert-butyl-2,2'-bipyridine; phen = 1,10-phenanthroline) having distinct electrochemical characteristics were evaluated. Electrochemical impedance spectroscopy (EIS) measurements reveal that [Co(bpy)(3)](3+/2+) and [Co(phen)(3)](3+/2+) mediators exhibit relatively fast heterogeneous electron transfer rates with porous PEDOT/ClO4 electrodes (k = 7 x 10(-3) cm s(-1) and 2.1 x 10(-3) cm s(-1), respectively) and correspondingly low charge transfer resistances (<1 Omega) that are competitive with results obtained for Au and Pt coated electrodes. The bulkier [Co(dtb)(3)](3+/2+) mediator exhibits a more complex surface dependent electrochemistry yielding somewhat faster electron transfer kinetics on gold (3.8 x 10(-4) cm s(-1)) relative to PEDOT/ClO4 (1.7 x 10(-4) cm s(-1)) coated counter electrodes. Nevertheless, this work establishes that porous PEDOT/ClO4 counter electrodes, because in part of their enhanced electroactive surface area and reduced charge transfer resistance, possess sufficient electrocatalytic properties when paired with cobalt-based redox mediators to make PEDOT-based counter electrodes attractive for use in DSC applications. (literal)

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