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Effect of Fabrication Processing on Structure and Properties of Mesoporous Carbon Materials

Author: MiPanPan
Tutor: WangTongHua
School: Dalian University of Technology
Course: Chemical Engineering and Technology
Keywords: Soft Template Ordered Mesoporous Carbon Surfactant Drying Methods ThePore Size
CLC: O631.3
Type: Master's thesis
Year: 2013
Downloads: 57
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Abstract


Ordered mesoporous carbon material has advanced properties, such as high electrical and thermal conductivity, high corrosive and thermal resistance and uniform pore diameter, with potential application in electrode materials, catalyst support and separation material in the field of energy storage and environment protection. Due to the great effect of porous structure of mesoporous carbon materials on application of the materials, the research of the porous structure property of the ordered mesoporous carbon material has become the one of the aims of the mesoporous carbon materials research work.The mesoporous polymer was synthesized by the evaporation-induced self-assembly method with the resorcinol-formaldehyde (carbon source) and the pluronic F127(template), then dried and carbonized at the high temperature under nitrogen to get ordered mesopore carbons. The preparation process parameters of the mesoporous polymer such as synthesis process, carbonization process, drying process were discussed. The mesoporous carbon material were investigated by FT-IR, XRD, HRTEM, FESEM and N2adsorption. The effects of the various process parameters for the ordering and pore size distribution of mesoporous carbon were studied, and the formation mechanism of mesoporous carbon was proposed, meanwhile the electrochemical performance of mesoporous carbon materials was discussed.The results show that the ordered mesoporous carbon can be prepared under the following conditions:the reaction temperature of45℃, the molar ratio of F127of0.0081, stirring speed of500r/min, stirring time of6h, stewing temperature of35℃, stewing evaporating temperature of35℃, stewing evaporating time of24h, high temperature curing heating rate of1℃/min, high temperature curing temperature of90℃and carbonized temperature of800℃. The mesoporous carbon obtained exhibits highly ordered2D hexagonal mesostructure, with a typical BET surface area of696.78m2/g and pore size of7.75nm.The pore and carbon structure of mesoporous carbon material are greatly affected by the different drying methods (freezing drying, water bath drying, air oven drying and vacuum oven drying) or the rates of the ethanol volatilization during drying of mesopore polymer on structures. The OMCs prepared under the freezing drying have a high ordered two dimensional hexagonal mesopore structure with the specific surface area and mean pore size of744.1m2/g and6.4nm, respectivly. And the OMCs prepared under the vacuum oven drying have a worm-like pore structure. The specific surface area is506.9m2/g and mean pore size is9.16nm. The ordering, pore size and microstructure of the OMCs could be tuned by the rate of the ethanol volatilization in different drying methods.In my article, The mesoporous carbon was used as electrode materials of supercapacitor for testing the capacitor performance of the mesoporous carbon materials before and after activation. The result show that:the specific surface area of the mesoporous carbon after activation from673.798m2/g to1458.86m2/g, and the conductivity enhancement of the mesoporous carbon material after activation in the0.5A·g-1from135F·g-1up to180F·g-1, the electric double layer capacitor behavior of the mesoporous carbon material improved.

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers > The chemical nature of polymers
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