| Aerogels are novel, low density, nano-porous, non-crystalline, monolithic, mamometer materials, whose continuous network structures can be controlled and tailored at the nanoscale. Due to their special network structures, carbon aerogels take on some excellent properties, such as the larger specific area, the good electric conductivity, and the alterable density. Therefore, using carbon aerogels as electrode materials for electrochemical double-layer capacitor is extremely attractive and promising. Normally, the polymerization of resorcinol (R) with formaldehyde (F) catalyzed by sodium carbonate results in the formation of dark red, transparent RF organic aerogels via a sol-gel process, acid aging process, and supercritrical fluid drying or ambient pressure drying. Upon pyrolysis of RF organic precursors at high temperature, the monolithic RF carbon aerogels can be obtained.In this dissertation, a novel organic and inorganic hybrid aerogel of SiO2/C is synthesized by two-step method of sol-gel polycondensation reaction using resorcinol-formaldehyde and tetraethoxysilane (TEOS) in acetone solution, followed by drying with supercritical petroleum ether.The structure and properties of SiO2/C hybrid aerogel were measured by high diffracted electron microscope (HREM), nitrogen adsorption and... |
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