title: Reduced graphite oxide in supercapacitor electrodes.
abstract: The current energy needs have put the focus on highly efficient energy storage systems such as supercapacitors. At present, much attention focuses on graphene-like materials as promising supercapacitor electrodes. Here we show that reduced graphite oxide offers a very interesting potential. Materials obtained by oxidation of natural graphite and subsequent sonication and reduction by hydrazine achieve specific capacitances as high as 170 F/g in H2SO4 and 84F/g in (C2H5)4NBF4/acetonitrile. Although the particle size of the raw graphite has no significant effect on the physico-chemical characteristics of the reduced materials, that exfoliated from smaller particles (<75 μm) result more advantageous for the release of the stored electrical energy. This effect is particularly evident in the aqueous electrolyte. Graphene-like materials may suffer from a drop in their specific surface area upon fabrication of electrodes with features of the existing commercial devices. This should be taken into account for a reliable interpretation of their performance in supercapacitors.
authors: Instituto Nacional del Carbón - CSIC, Apartado 73, 33080 Oviedo, Spain.
authors: Belén
authors: B
authors: Lobato
authors: Danubia NanoTech, s.r.o., Ilkovicova 3, 841 04 Bratislava, Slovakia; STU Centre for Nanodiagnostics, Vazovova 5, 812 43 Bratislava, Slovakia.
authors: Viliam
authors: V
authors: Vretenár
authors: Danubia NanoTech, s.r.o., Ilkovicova 3, 841 04 Bratislava, Slovakia.
authors: Peter
authors: P
authors: Kotrusz
authors: Danubia NanoTech, s.r.o., Ilkovicova 3, 841 04 Bratislava, Slovakia; Institute of Electrical Engineering, SAS, Dúbravská cesta 9, 841 04 Bratislava, Slovakia.
authors: Martin
authors: M
authors: Hulman
authors: Instituto Nacional del Carbón - CSIC, Apartado 73, 33080 Oviedo, Spain. Electronic address: teresa@incar.csic.es.
authors: Teresa A
authors: TA
authors: Centeno
keywords: Electrode surface; Graphene material; Reduced graphite oxide; Supercapacitor