Abstract
Porous carbon spheres were prepared by interfacial sol–gel polymerization. The microstructure of the carbon spheres is investigated by SAXS, TEM, and FE-SEM. The framework of resulting carbon sphere is hollow structure with a cavity of about 200 nm diameter. The structure of hollow carbon sphere wall is mesopores with average pore diameter of 5–26 nm, porosity of 0.52–0.91, and specific surface of 210–670 m 2/cm 3 and 747–1606 m 2/g. The pore characteristic of the hollow carbon spheres varies with different carbon source concentration. The carbon spheres whose precursor solution concentration is 52 wt%, have the highest specific surface area of 1606 m 2/g. Cryogenic hydrogen sorption capacity was determined at 77 K, and hydrogen uptake of 2.37 wt% was achieved for the porous carbon spheres.
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