Preparation and characterization of carbon aerogel microspheres by an inverse emulsion polymerization |
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Authors: | Xingyan Wang Xianyou Wang Li Liu Hongfang An Lanhua Yi |
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Institution: | a Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, Chemistry School, Xiangtan University, Hunan, Xiangtan 411105, Chinab Hunan Institute of Humanities Science and Technology, Loudi 417000, Chinac Key Laboratory of Materials Design and Preparation Technology of Hunan Province, Xiangtan 411105, China |
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Abstract: | Carbon aerogel (CA) microspheres have been successfully synthesized by an inverse emulsion polymerization and characterized by scanning electron microscopy (SEM), N2 sorption isotherm and X-ray diffraction (XRD). The results show that the size and pore characteristics of carbon microsphere obviously depend on stirring speed and concentration of surfactant in the emulsion polymerization process. The resultant CA microspheres are amorphous carbon structure with the size ranging from about 2 to 50 μm by changing the stirring speed. CA microspheres with SBET of 414-603 m2 g− 1 and Vmeso of 0.028-0.432 cm3 g− 1 are synthesized using different SPAN80 concentrations. The results of cyclic voltammetry indicate that the CA microspheres prepared at a stirring speed of 480 rpm and at Vs/Vh = 0.01 have ideal supercapacitive behavior in 6 M KOH electrolyte, the maximum specific capacitance of the electrode reaches 180 F g− 1. |
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Keywords: | Carbon aerogel microspheres Inverse emulsion polymerization Specific surface area Specific capacitance |
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