Preparation of Monolithic Carbon Xerogels with Graphene Oxide for Electrode Application
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Monolithic carbon xerogels with co-continuous porosity were prepared via one-step, catalyst-free hydrothermal reaction from resorcinol (R), formaldehyde (F) and mildly oxidized few-layer-graphene oxide (FLGO). Monolithic carbon xerogels were prepared in a pressurized Teflon mold at 100 ℃ for 6 h, while R/F and R/W ratios were optimized to afford co-continuous pore structure with interconnected carbon particles in the presence of FLGO. In addition, few-layer-graphene oxide (FLGO) with different oxidation time was also utilized to give maximum electrical conductivity. The samples then dried at 60 ℃ for 36 h and then 100 ℃ for 12 h, followed by pyrolysis at 900 ℃ for 2 h and CO2 activation at 1000 ℃ for 2, 4 or 6 h. Finally, the monolithic carbon xerogels were characterized by SEM and N2 adsorption-desorption measurements, while the electrochemical property of these xerogels were also studied via cyclic voltammetry.