Abstract
Porous graphene oxide (GO) structures at different oxidation levels have been obtained by a SC-CO2 assisted process performed at 200bar, 35°C and different durations up to 24h. Supercritical CO2 processing was aimed at exfoliating and reducing graphene oxide.Different techniques were used to characterize the materials obtained: transmission electron microscopy (TEM), Raman and FT-IR Spectroscopy, X-ray diffraction analysis and N2 adsorption-desorption at 77K. The materials with high surface area up to 930m2/g, obtained after SC-CO2 treatment, exhibited unique mesoporous structure based on curve graphene sheets and a high capacitive performance with values of 253F/g at 1A/g and of 210F/g at 16A/g; moreover, a good long cycle stability in aqueous electrolytes (higher than 90% after 2ÿ103 cycles) has been also obtained.SC-CO2 processing proved to be successful and simple to be realized, producing high performance materials, characterized by high specific surface areas and supercapacitive performances.
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