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

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)).