The use of tannin to prepare carbon gels. Part II. Carbon cryogels

Organic and derived carbon cryogels were prepared by sol–gel polycondensation of resorcinol (R) and formaldehyde (F) in the presence of mimosa tannin (T). We show that 2/3 in weight of the resorcinol can advantageously be replaced by tannin, and that resultant TRF organic gels can be freeze-dried and pyrolysed. The resultant low-cost carbon gels present similar pore textures than those of their expensive aerogel counterparts prepared from pure...