Preparation of hierarchical porous carbonaceous foams from Kraft black liquor

摘要: Kraft black liquor, an cheap and widely available biomass by-product, has been emulsified with 1,2-dichloroethane, then crosslinked by epichlorohydrin to prepare rigid macroporous bio-based monoliths. A subsequent thermal treatment under nitrogen of these materials produces carbon foams or carboHIPEs, hierarchical porosity: the original structure is preserved while mesopores micropores structuring walls are created. Specific surface areas 500–1000 m2 .g–1 micropore volumes 0.3–0.5 cm3 .g– 1 can be obtained. In addition, after a further at higher temperature, new carboHIPEs show exceptionally high electrical conductivity over 800 S. m–1. Therefore, they may find applications in field energy storage.