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.

Structure and supercapacitor performance of graphene materials obtained from brominated and fluorinated graphites / Bulusheva, L.G.; Tur, V.A.; Fedorovskaya, E.O.; Asanov, I.P.; Pontiroli, D.; Riccò, M.; Okotrub, A.V.. - In: CARBON. - ISSN 0008-6223. - 78(2014), pp. 137-146. [10.1016/j.carbon.2014.06.061]

Structure and supercapacitor performance of graphene materials obtained from brominated and fluorinated graphites

PONTIROLI, Daniele;RICCO', Mauro;
2014

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.
Structure and supercapacitor performance of graphene materials obtained from brominated and fluorinated graphites / Bulusheva, L.G.; Tur, V.A.; Fedorovskaya, E.O.; Asanov, I.P.; Pontiroli, D.; Riccò, M.; Okotrub, A.V.. - In: CARBON. - ISSN 0008-6223. - 78(2014), pp. 137-146. [10.1016/j.carbon.2014.06.061]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2787077
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