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We developed an upcycling process of polyurethane obtaining porous nitrogen-doped carbon materials that were applied in supercapacitor electrodes. In detail, a mechanochemical solvent-free one-pot synthesis is used and combined with a thermal treatment. Polyurethane is an ideal precursor already containing nitrogen in its backbone, yielding nitrogen-doped porous carbon materials with N content values of 1-8 wt %, high specific surface area values of up to 2150 m 2 ·g -1 (at a N content of 1.6 wt %) and large pore volume values of up to 0.9 cm 3 ·g -1 . The materials were tested as electrodes for supercapacitors in aqueous 1 M Li 2 SO 4 electrolyte (100 F·g -1 ), organic 1 M TEA-BF 4 (ACN, 83 F·g -1 ) and EMIM-BF 4 (70 F·g -1 ).

Upcycling of polyurethane waste by mechanochemistry: synthesis of N-doped porous carbon materials for supercapacitor applications