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Issue 3, 2014
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Edge-carboxylated graphene nanoplatelets as oxygen-rich metal-free cathodes for organic dye-sensitized solar cells

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Abstract

Edge-carboxylated graphene nanoplatelets (ECGnPs) were synthesized by the simple, efficient and eco-friendly ball-milling of graphite in the presence of dry ice and used as oxygen-rich metal-free counter electrodes (CEs) in organic dye-sensitized solar cells (DSSCs), for the first time. The resultant ECGnPs are soluble in many polar solvents including 2-propanol due to the polar nature of numerous carboxylic acids at edges, allowing an electrostatic spray (e-spray) to be deposited on fluorine-doped SnO2 (FTO)/glass substrates. The ECGnP-CE exhibited profound improvements in the electrochemical stability for the Co(bpy)32+/3+ redox couple compared to the platinum (Pt)-CE. The charge transfer resistance (RCT), related to the interface between an electrolyte and a CE, was significantly reduced to 0.87 Ω cm2, much lower than those of (Pt)-CE (2.19 Ω cm2), PEDOT:PSS-CE (2.63 Ω cm2) and reduced graphene oxide (rGO)-CE (1.21 Ω cm2). The DSSC based on the JK-303-sensitizer and ECGnP-CE displayed a higher photovoltaic performance (FF, Jsc, and η, 74.4%, 14.07 mA cm−2 and 9.31%) than those with the Pt-CE (71.6%, 13.69 mA cm−2 and 8.67%), PEDOT:PSS (68.7%, 13.68 mA cm−2 and 8.25%) and rGO-CE (72.9%, 13.88 mA cm−2 and 8.94%).

Graphical abstract: Edge-carboxylated graphene nanoplatelets as oxygen-rich metal-free cathodes for organic dye-sensitized solar cells

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Supplementary files

Article information


Submitted
14 Nov 2013
Accepted
10 Dec 2013
First published
21 Jan 2014

Energy Environ. Sci., 2014,7, 1044-1052
Article type
Paper
Author version available

Edge-carboxylated graphene nanoplatelets as oxygen-rich metal-free cathodes for organic dye-sensitized solar cells

M. J. Ju, I. Jeon, K. Lim, J. C. Kim, H. Choi, I. T. Choi, Y. K. Eom, Y. J. Kwon, J. Ko, J. Lee, J. Baek and H. K. Kim, Energy Environ. Sci., 2014, 7, 1044
DOI: 10.1039/C3EE43732A

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