ИСТИНА

High specific surface and electronic conductivity of graphene and its composites allow one to consider these materials as promising components for the production of supercapacitors [1-4]. However, no data are available on application of partially fluorinated graphene in this field. Here we have reported the results of our investigation of specific capacitance of nanostructured composites based on reduced graphene oxide (RGO) and fluorinated RGO (FRGO). RGO was prepared by microwave treatment of graphite oxide obtained from graphite [5]. Fluorination of RGO carried out with xenon difluoride at 70 °С. X-ray photoelectron spectroscopy (XPS) was used to determine the elemental composition of the products. The fluorine content (F/C at. ratio) in the samples was found to vary within the range of 0.25 – 0.35. The specific capacitance of composites of RGO and FRGO with PEDOT:PSS as conductive polymeric binder were measured by using cyclic voltammetry according to recently described procedure [6]. Significant increase of specific capacitance of FRGO-based composite compared to RGO-based one was observed. Specific capacitances were 26 and 44 F/g for RGO-based and FRGO-based composites, respectively (0.15 M Bu4NBF4/1,2-dichlorobenzene as an electrolyte). Influence of electrode mass loading, number of cycles, and potential range on specific capacitance values are discussed. This work was partially supported by the Russian Foundation for Basic Research (grant no. 15-03-04987 and 13-03-00311a). References 1. HaoL.,LiX.,ZhiL.Carbonaceouselectrodematerialsforsupercapacitors.//Adv.Mater.2013. Vol. 25, No 28. P. 3899–3904. 2. IslamM.M.etal.LiquidCrystallineGrapheneOxide/PEDOT:PSSSelf-Assembled3DArchitecture for Binder-Free Supercapacitor Electrodes // Front. Energy Res. 2014. Vol. 2, No August. P. 1–11. 3. AntiohosD.etal.CompositionaleffectsofPEDOT-PSS/singlewalledcarbonnanotubefilmson supercapacitor device performance // J. Mater. Chem. 2011. Vol. 21, No 40. P. 15987. 4. WengY.-T.,WuN.-L.High-performancepoly(3,4-ethylene-dioxythiophene):polystyrenesulfonate conducting-polymer supercapacitor containing hetero-dimensional carbon additives // J. Power Sources. Elsevier B.V, 2013. Vol. 238. P. 69–73. 5. Y.M.Shulga,S.A.Baskakov,E.I.Knerelman,G.I.Davidova,E.R.Badamshina,N.Yu.Shulga,E.A. Skryleva,A.L.Agapov,D.N.Voylov,A.P.SokolovandV.M.Martynenko,RSCAdv.(2014) 4,587. 6. StollerM.D.,RuoffR.S.Bestpracticemethodsfordetermininganelectrodematerial’s performance for ultracapacitors // Energy Environ. Sci. 2010. Vol. 3, No 9. P. 1294.