Optically Transparent Cathode for Dye-Sensitized Solar Cells Based on Graphene Nanoplatelets

0358445 - ÚFCH JH 2012 RIV US eng J - Článek v odborném periodiku
Kavan, Ladislav - Yum, J. H. - Graetzel, M.
Optically Transparent Cathode for Dye-Sensitized Solar Cells Based on Graphene Nanoplatelets.
ACS Nano. Roč. 5, č. 1 (2011), s. 165-172. 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 cells * electrochemical impendance
Kód oboru RIV: CG - Elektrochemie
Impakt faktor: 10.774, rok: 2011

Commercial graphene nanoplatelets in the form of optically transparent thin films on F-doped SnO2 (FTO) exhibited high electrocatalytic activity toward I3−/I− redox couple, particularly in electrolyte based on ionic liquid (Z952). The charge-transfer resistance, RCT, was smaller by a factor of 5−6 in ionic liquid, compared to values in traditional electrolyte based on methoxypropionitrile solution (Z946). Optical spectra and electrochemical impedance confirm that the film’s absorbance scales linearly with RCT−1. Electrocatalytic properties of graphene nanoplatelets for the I3−/I− redox reaction are proportional to the concentration of active sites (edge defects and oxidic groups), independent of the electrolyte medium. Dye-sensitized solar cell (DSC) was assembled with this material as a cathode.
Trvalý link: http://hdl.handle.net/11104/0196488