One‐pot synthesis of two‐dimensional porphyrin‐based polymer and derived N‐doped porous carbon as efficient oxygen reduction catalysts

This work describes the synthesis and functions of a two‐dimensional porous polymer based on porphyrin. Upon condensation, coordination and treatment with high temperature, porphyrin‐based porous carbon nanosheets were obtained with the high specific surface area of 466 m 2 g −1 . Benefiting from its high surface area, co‐doping with iron/nitrogen and hierarchical porous structure, the optimised example exhibits excellent electrochemical performance for the oxygen reduction reaction under alkaline conditions with a low half‐wave potential of 0.73 V (lower than 0.78 V for Pt/C), a dominant four‐electron transfer mechanism ( n = 3.97 at 0.64 V) and a high diffusion limiting current density of 5.27 mA cm −2 .