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This study presents a sustainable strategy for the development of metal-free electrocatalysts derived from degraded aromatic co-poly(urea-thiourea)s. Upon pyrolysis under a nitrogen atmosphere, the polymers are transformed into N, S-co-doped turbostratic carbon nanomaterials with a high specific surface area exceeding 1,000 m 2 ·g −1  and an optimized electronic structure. The resulting materials exhibit outstanding electrocatalytic performance in the oxygen reduction reaction (ORR), characterized by a high onset potential (0.96 V), half-wave potential (0.82 V), large limiting current density (−6.21 mA·cm −2 ), and a low Tafel slope (87.6 mV·dec −1 ). The number of electrons transferred during ORR is close to 3.9, approaching the ideal four-electron pathway. The material delivers a maximum power density of 443.8 mW·cm −2 , outperforming that of commercial Pt/C.

Metal-free N, S-co-doped carbon materials derived from calcined aromatic co-poly(urea-thiourea)s as efficient alkaline oxygen reduction catalysts