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Ordered mesoporous carbide-derived carbons prepared by soft templating

: Borchardt, L.; Oschatz, M.; Lohe, M.; Presser, V.; Gogotsi, Y.; Kaskel, S.


Carbon 50 (2012), Nr.11, S.3987-3994
ISSN: 0008-6223
Fraunhofer IWS ()
Kohlenstoff; Carbid; Siliciumcarbid; Fluorwasserstoffsäure; Tetraethylorthosilicat; Citrat; Phenolharz; Titancarbid; Verdunstung; Komposit; Porenstruktur; Selbstassemblierung; Hochtemperatur

Free-standing films of ordered mesoporous silicon and titanium carbide-derived carbons have been synthesized using a novel soft templating approach without employing hydrofluoric acid. Tetraethyl orthosilicate or titanium citrate, alternatively, and a phenolic resin underwent an evaporation induced self-assembly yielding ordered mesoporous silicon carbide/carbon or titanium carbide/carbon composites. High temperature chlorine treatment transformed these materials conformally into carbide-derived carbons (CDC) while the ordered arrangement of mesopores was maintained. The corresponding hierarchical pore structures consist of narrowly distributed micro- and mesopores (distribution maxima at 1 and 5 nm, respectively) with a high surface area and pore volume of up to 1538 m 2/g and 2.53 cm 3/g , respectively.