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Baek, Jong-Beom
Center for Dimension-Controllable Organic Frameworks
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Edge-Fluorinated Graphene Nanoplatelets as High Performance Electrodes for Dye-Sensitized Solar Cells and Lithium Ion Batteries

Author(s)
Jeon, In-YupJu, Myung JongXu, JiantieChoi, Hyun-JungSeo, Jeong-MinKim, Min-JungChoi, In TaekKim, Hong MoKim, Jae CheonLee, Jae-JoonLiu, Hua KunKim, Hwan KyuDou, ShixueDai, LimingBaek, Jong-Beom
Issued Date
2015-02
DOI
10.1002/adfm.201403836
URI
https://scholarworks.unist.ac.kr/handle/201301/10326
Fulltext
http://onlinelibrary.wiley.com/doi/10.1002/adfm.201403836/abstract
Citation
ADVANCED FUNCTIONAL MATERIALS, v.25, no.8, pp.1170 - 1179
Abstract
Edge-selectively fluorinated graphene nanoplatelets (FGnPs) are prepared by mechanochemically driven reaction between fluorine gas (20 vol% in argon) and activated carbon species from graphitic C-C bonds unzipped by high-speed stainless steel balls with a high kinetic energy. The fluorination at edges of the unzipped graphene nanoplatelets (GnPs) is confirmed by various analytical techniques while the content of fluorine in FGnPs is determined to be 3.0 and 3.4 at% by X-ray photoelectron spectroscopy and energy-dispersive X-ray spectroscopy, respectively. Because of the large difference in electronegativity between carbon (χ = 2.55) and fluorine (χ = 3.98) and the strong C-F bond, the edge-fluorination of GnPs can provide the maximized charge polarization with an enhanced chemical stability. Thus, electrodes based on the resultant FGnPs demonstrate superb electrochemical performance with excellent stability/cycle life in dye-sensitized solar cells (FF: 71.5%; Jsc: 14.44 mA cm-2; Voc: 970 mV; PCE: 10.01%) and lithium ion batteries (650.3 mA h g-1 at 0.5 C, charge retention of 76.6% after 500 cycles).
Publisher
WILEY-V C H VERLAG GMBH
ISSN
1616-301X
Keyword
OXYGEN REDUCTION REACTIONMETAL-FREE ELECTROCATALYSTSFUNCTIONALIZED GRAPHENESTORAGE DEVICESNANOSTRUCTURED MATERIALSENERGY-CONVERSIONGRAPHITESURFACECAPACITYSHEETS

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