Graphene Nanoplatelet Cathode for Co(III)/(II) Mediated Dye-Sensitized Solar Cells

Graphene nanoplatelets (GNP) in the form of thin semitransparent film on F-doped SnO2 (FTO) exhibit high electrocatalytic activity for Co(L)2; where L is 6-(1H-pyrazol-1-yl)-2,2′-bipyridine. The exchange current densities for the Co2+/3+(L)2 redox reaction scaled linearly with the GNP film’s optical...

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Bibliographic Details
Published inACS nano Vol. 5; no. 11; pp. 9171 - 9178
Main Authors Kavan, Ladislav, Yum, Jun-Ho, Nazeeruddin, Mohammad Khaja, Grätzel, Michael
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 22.11.2011
Subjects
Cathodes
Dyes
Graphene
Nanostructure
Photovoltaic cells
Platinum
Redox reactions
Solar cells
Titanium dioxide
dye sensitized solar cell
graphene
cobalt redox shuttle
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Summary:Graphene nanoplatelets (GNP) in the form of thin semitransparent film on F-doped SnO2 (FTO) exhibit high electrocatalytic activity for Co(L)2; where L is 6-(1H-pyrazol-1-yl)-2,2′-bipyridine. The exchange current densities for the Co2+/3+(L)2 redox reaction scaled linearly with the GNP film’s optical absorbance, and they were by 1–2 orders of magnitude larger than those for the I3 –/I– couple on the same electrode. The electrocatalytic activity of GNP films with optical transmission below 88% is outperforming the activity of platinized FTO for the Co2+/3+(L)2 redox reaction. Dye-sensitized solar cells with Y123 dye adsorbed on TiO2 photoanode achieved energy conversion efficiencies between 8 and 10% for both GNP and Pt-based cathodes. However, the cell with GNP cathode is superior to that with Pt-FTO cathode particularly in fill factors and in the efficiency at higher illumination intensities.
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ISSN:1936-0851
1936-086X
DOI:10.1021/nn203416d