Journal
ACS NANO
Volume 5, Issue 1, Pages 165-172Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn102353h
Keywords
graphene; dye-sensitized solar cell; electrochemical impedance; ionic liquid; electrocatalysis
Categories
Funding
- Czech Ministry of Education, Youth and Sports [LC-510]
- Academy of Sciences of the Czech Republic [IAA 400400804, KAN 200100801]
- EC [NMP-229036]
- Molesol [256617]
- European Research Council (ERC) [ERC-2009-AdG, 247404 MESOLIGHT]
- Korea Foundation for International Cooperation of Science & Technology through the Global Research Lab
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Commercial graphene nanoplatelets in the form of optically transparent thin films on F-doped SnO2 (FTO) exhibited high electrocatalytic activity toward I-3(-)/I- redox couple, particularly in electrolyte based on, ionic liquid (Z952). The charge-transfer resistance, R-CT, was smaller by a factor of 5-6 in ionic liquid, compared to values in traditional electrolyte based on methoxyproplonitrile solution (Z946). Optical spectra and electrochemical impedance confirm that the film's absorbance scales linearly with R-CT(-1). Electrocatalytic properties of grephene nanoplatelets for the I-3(-)/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. Semitransparent (> 85%) film of graphene nanoplatelets presented no barrier to drain photocurrents at 1 Sun illumination and potentials between 0 and ca. 03 V, but an order of magnitude decrease of R-CT is still needed to improve the behavior of DSC near the open circuit potential and consequently, the fill factor. We predict that the graphene composite is a strong candidate for replacing both Pt and FTO in cathodes for DSC.
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