Pore structure and electrochemical performances of tannin-based carbon cryogels

Abstract. Carbon cryogels have been obtained by freeze-drying and pyrolysis of a family of tannin formaldehyde organic gels prepared at different pHs. Such new materials, cheap and derived from biomass at a mass fraction of 0.8, were completely characterised in terms of pore structure and density. Samples obtained at pH higher than 6 were extremely lightweight and presented surface areas highe…