Natural phenolic materials treated by a wet path: synthesis of bioresourced carbons highly porous and applications

Abstract : Renewable resources are considered as sustainable, and sometimes cheaper, alternatives to substitute raw materials of petrochemical origin. We used tannins extracted from Mimosa barks. Tannin is an attractive precursor to synthesize new organic porous materials due to the presence of highly reactive phenolic molecules. The synthesis of these new carbon materials from tannin comprises a two-step process: the first step is a hydrothermal carbonization at moderate temperatures, 180-200°C, which allows obtaining a hydrochar, richer in carbon, and fixing other heteroatoms. These hydrochars present different morphologies as powder or gel. The second step is a carbonization at higher temperature (900°C), which allows increasing surface area (SBET), porosity as well as improving conductivity. The preparation of a porous carbon presenting mesopores perfectly defined in size and in their organization was realized by associating tannin, as carbon precursor, with a surfactant for porosity templating, the copolymer Pluronic F127. These new carbon materials were tested as electrodes of supercapacitor
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Flavia Lega Braghiroli. Natural phenolic materials treated by a wet path: synthesis of bioresourced carbons highly porous and applications. Other. Université de Lorraine, 2014. English. ⟨NNT : 2014LORR0249⟩. ⟨tel-01751263⟩

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