For a typical procedure, 10 g F127 copolymer was mixed with 85 g ethanol. The resulting solution was heated up to 40 C to form a clear solution under stirring. 25 g resol alcoholic solution (40 wt%) was added in the above solution and kept stirring at room temperature over 6 h to obtain the precursor solution. 0.4 g of commercially available melamine sponge
without any pretreatment was immersed into the above solution and sealed overnight. The above mixture was then
exposed to air, and the spontaneous evaporation of solvent ensured the carbon precursor uniformly coated on the skeleton of the sponge. The block copolymer and resol aggregated and crosslinked into micell and resin, respectively. Composite was achieved by thermally curing of the coated skeleton at 100 C for 24 h. The composite was then transferred to a tubular
furnace for pyrolysis under a nitrogen flow and heated to
350, 600, and 1000 C at 1 C/min and held at these temperatures
for 2 h, respectively. The resultant black carbon monolith
was denoted as C-x, where x indicates the last pyrolysis
temperature.
For a typical procedure, 10 g F127 copolymer was mixed with 85 g ethanol. The resulting solution was heated up to 40 C to form a clear solution under stirring. 25 g resol alcoholic solution (40 wt%) was added in the above solution and kept stirring at room temperature over 6 h to obtain the precursor solution. 0.4 g of commercially available melamine spongewithout any pretreatment was immersed into the above solution and sealed overnight. The above mixture was thenexposed to air, and the spontaneous evaporation of solvent ensured the carbon precursor uniformly coated on the skeleton of the sponge. The block copolymer and resol aggregated and crosslinked into micell and resin, respectively. Composite was achieved by thermally curing of the coated skeleton at 100 C for 24 h. The composite was then transferred to a tubularfurnace for pyrolysis under a nitrogen flow and heated to350, 600, and 1000 C at 1 C/min and held at these temperaturesfor 2 h, respectively. The resultant black carbon monolithwas denoted as C-x, where x indicates the last pyrolysistemperature.
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