Abstract
Biomorphic carbide ceramics (TiC and SiC) derived from paper were converted into porous carbide-derived carbon (CDC) by selective high temperature etching of the metal in chlorine containing atmosphere. The pore structure and degree of structural order of CDC can be controlled varying the carbide precursor, reaction temperature, and adding a catalytic active transition metal such as Fe, Ru, or Fe/Ru during the chlorination process. The specific surface area (SSA) and micropore volume of CDC can be enhanced by post-synthesis treatment in carbon dioxide. Partial conversion of the biomorphic carbides leads to formation of CDC–carbide composites with controllable composition and microstructure. The unique properties of porous CDC are high SSA and tunable pore size with a narrow pore-size distribution. CDC derived from biomorphic fibrous carbide structures has additionally the advantage of shape stability and very good mechanical performances.
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