Edge-carboxylated graphene nanoplatelets as oxygen-rich metal-free cathodes for organic dye-sensitized solar cells
| Autor: | Myung Jong Ju, In-Yup Jeon, Yu Kyung Eom, Kimin Lim, In Taek Choi, Hwan Kyu Kim, Hyun-Jung Choi, Jaejung Ko, Jong-Beom Baek, Jae-Joon Lee, Jae Cheon Kim, Young Jin Kwon |
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| Rok vydání: | 2014 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Graphene Oxide chemistry.chemical_element Nanotechnology Electrolyte Electrochemistry Pollution law.invention Dye-sensitized solar cell chemistry.chemical_compound Nuclear Energy and Engineering chemistry Chemical engineering PEDOT:PSS law Environmental Chemistry Graphite Platinum |
| Zdroj: | Energy Environ. Sci.. 7:1044-1052 |
| ISSN: | 1754-5706 1754-5692 |
| DOI: | 10.1039/c3ee43732a |
| Popis: | 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%). |
| Databáze: | OpenAIRE |
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