Graphitic mesoporous carbons synthesised through mesostructured silica templates |
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Authors: | Antonio B Fuertes Sonia Alvarez |
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Affiliation: | Instituto Nacional del Carbón (CSIC), Department of Chemistry and Materials, P.O. Box 73, 33080 Oviedo, Spain |
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Abstract: | In this paper the fabrication and characterization of graphitizable and graphitized porous carbons with a well-developed mesoporosity is described. The synthetic route used to prepare the graphitizable carbons was: (a) the infiltration of the porosity of mesoporous silica with a solution containing the carbon precursor (i.e. poly-vinyl chloride, PVC), (b) the carbonisation of the silica–PVC composite and (c) the removal of the silica skeletal. Carbons obtained in this way have a certain graphitic order and a good electrical conductivity (0.3 S cm−1), which is two orders larger than that of a non-graphitizable carbon. In addition, these materials have a high BET surface area (>900 m2 g−1), a large pore volume (>1 cm3 g−1) and a bimodal porosity made up of mesopores. The pore structure of these carbons can be tailored as a function of the type of silica selected as template. Thus, whereas a graphitizable carbon with a well-ordered porosity is obtained from SBA-15 silica, a carbon with a wormhole pore structure results when MSU-1 silica is used as template. The heat treatment of a graphitizable carbon at a high temperature (2300 °C) allows it to be converted into a graphitized porous carbon with a relatively high BET surface area (260 m2 g−1) and a porosity made up of mesopores in the 2–15 nm range. |
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Keywords: | A Porous carbon B Carbonisation C Adsorption X-ray diffraction D Electrical properties |
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