期刊
NANO ENERGY
卷 13, 期 -, 页码 336-345出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2015.02.037
关键词
Ball-milling; Halogenations; Graohene nanoolatelets; Dye-sensitized solar cells; Counter electrode
类别
资金
- Creative Research Initiative (CRI)
- BRL
- BK21 Plus
- Mid-Career Researcher programs - NRF
- Converging Research Center Program through the Ministry of Science, ICT and Future Planning, Korea [2013K000203]
- ICET [20148520011250]
- New & Renewable Energy Core Technology Program - MTIE [20133030000140]
- International Science and Business Belt Program through the Ministry of Science, ICT and Future Planning [2012K001573]
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.
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