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

0367630 - ÚFCH JH 2012 RIV US eng J - Článek v odborném periodiku
Kavan, Ladislav - Yum, J. H. - Nazeeruddin, M. K. - Grätzel, M.
Graphene Nanoplatelet Cathode for Co(III)/(II) Mediated Dye-Sensitized Solar Cells.
ACS Nano. Roč. 5, č. 11 (2011), s. 9171-9178. ISSN 1936-0851. E-ISSN 1936-086X
Grant CEP: GA MŠMT LC510; GA AV ČR IAA400400804; GA AV ČR KAN200100801
Výzkumný záměr: CEZ:AV0Z40400503
Klíčová slova: graphene * dye sensitized solar cell * cobalt redox shuttle
Kód oboru RIV: CG - Elektrochemie
Impakt faktor: 10.774, rok: 2011

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.
Trvalý link: http://hdl.handle.net/11104/0202231