Morphology and properties of carbon foams via high internal phase emulsion templating
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Carbon foam having open cell structure can be prepared through the carbonization of polystyrene (PS) foam via high internal phase emulsion. However, since styrenic polymers do not have strong crosslinks, it is extremely difficult to retain their morphology during pyrolysis. To solve this problem, sulfonyl bridges were introduced by sulfonating the PS foam. Further, CNTs modified with polypyrrole, a conducting polymer, were incorporated to improve electrical conductivity, and porogens were added to increase surface area of the PS foam. The prepared foam was carbonized at 800°C to obtain a carbon foam with a hierarchical micro-/meso-pore structure. To evaluate the performance of the carbon foam as an electrode material of supercapacitor, electrode slurries utilizing the carbon foam were prepared and their electrical properties were analyzed.