Author/Authors :
Bulusheva، نويسنده , , L.G. and Tur، نويسنده , , V.A. and Fedorovskaya، نويسنده , , E.O. and Asanov، نويسنده , , I.P. and Pontiroli، نويسنده , , D. and Riccٍ، نويسنده , , M. and Okotrub، نويسنده , , A.V.، نويسنده ,
Abstract :
Two few-layer graphene materials, strongly distinguished in structure, were compared as electrode materials for supercapacitor. The stacks of flat sheets with basal size of a few microns have been obtained as the result of ultrasonication of bromine intercalated graphite dispersion. The highly crumpled large-size layers have been produced by rapid heating of bromine intercalated graphite fluoride. The average number of layers and in-plane crystalline size in the materials were evaluated from Raman spectroscopy. The functional composition was studied using X-ray photoelectron and Infrared spectroscopy. Electrochemical testing of the graphene materials detected re-stacking of thin crumpled layers during the electrode preparation. Furthermore, graphene material produced from the fluorinated graphite showed poor wettability. The mild oxidation of the material in a mixture of sulfuric and nitric acids allowed increasing the capacitance in several times.
