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- Baek, Jong-Beom
- Center for Dimension-Controllable Organic Frameworks
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High-performance dye-sensitized solar cells using edge-halogenated graphene nanoplatelets as counter electrodes
- Author(s)
- Jeon, In-Yup, Kim, Hong Mo, Choi, In Taek, Lim, Kimin, Ko, Jaejung, Kim, Jae Cheon, Choi, Hyun-Jung, Ju, Myung Jong, Lee, Jae-Joon, Kim, Hwan Kyu, Baek, Jong-Beom
- Issued Date
- 2015-04
- Citation
- NANO ENERGY, v.13, pp.336 - 345
- Abstract
- Edge-selectively halogenated graphene nanoplatelets (XGnPs, X=C1, Br, and I) were prepared by the mechanochemically driven reaction between graphite and diatomic halogen molecules (Cl-2, Br-2 or 12). The contents of halogens (Cl, Br, and I) in XGnPs were 3.18, 1.77, and 0.66 at%, respectively, by X-ray photoelectron spectroscopy. The XGnPs as counter electrodes (CEs) showed remarkably enhanced electrocatalytic activities toward Co(bpy)(3)(3+) reduction reaction in dye-sensitized solar cells (DSSCs) with an excellent electrochemical stability. Amongst XGnPs, IGnP-CE demonstrated the lowest charge-transfer resistance (R-ct of 0.46 Omega cm(2) at the CE/electrolyte interface. This value is much lower than that of Pt-CE (0.81 Omega cm(2)). In addition, the DSSC with IGnP-CE had the highest fill factor (71.3%) and cell efficiency (10.31%), whereas those of DSSCs with Pt-CE were only 70.6% and 9.92%, respectively. (C) 2015 Elsevier Ltd. All rights reserved
- Publisher
- Elsevier BV
- ISSN
- 2211-2855
- Keyword (Author)
- Ball-milling, Halogenations, Graohene nanoolatelets, Dye-sensitized solar cells, Counter electrode
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