Heteroatom-doped porous carbon materials have shown great potential of application in energy conversion and storage. In this work, a novel nitrogen-doped porous carbon nanomaterial has been synthesized by directly pyrolyzing the tetrazine/pyridine/triazine-containing porous organic polymer under inert conditions. Benefiting from the high surface area (574 m2 g–1) and enriched nitrogen doping (5.63 at. % N), the obtained porous carbon nanoparticles (TPOP-900) used as metal-free ORR electrocatalyst possesses better electrochemical performance (E 0 = 11 mV; E 1/2 = −90 mV vs Ag/AgCl) than that of Pt/C. Moreover, the TPOP-900 served as electrode material for supercapacitor; it exhibits relatively high specific capacitance (250 F g–1 at 0.5 A g–1) and excellent cycling stability (95.75% capacitance retention after 10 000 cycles) in 6 M KOH aqueous electrolyte.

Nitrogen-doped porous carbon materials have now become one of the most important candidates for efficient oxygen reduction electrocatalysis and supercapacitors because of their low cost and high stability. In the present study, a novel triazine-based, quaternary bipyridinium-type framework (TBPF) is synthesized by polycondensation of 4,4'-bipyridine with cyanuric chloride. The as-synthesized TBPF is then subject to pyrolysis at 900°C, yielding N-doped porous carbon (N/C-900). The N/C-900 material possesses brain-like architecture, high Ncontaining functionalities (5.40 at.% N), and relatively high specific surface area (684 m 2 g À 1 ), which can act as a truly metal-free catalyst toward ORR and an electrode material for supercapacitors. Due to the synergistic effects, the N/C-900 material shows outstanding ORR electrocatalytic activity and stability in alkaline media with an onset potential of 0.969 V (vs RHE), a half-wave potential of 0.843 V (vs RHE), a limited current density of 5.05 mA cm À 2 , and a 3 mV negative shift of half-wave potential after 3000 cycles. Furthermore, the N/C-900-based supercapacitor electrode also displays relatively high specific capacitance (217 F g À 1 at 0.5 A g À 1 ) and excellent stability (96 % capacitance retention after 10000 cycles) in 6 M KOH electrolyte. and acetone. After drying to a constant mass, a dark green powder was obtained with a yield of 91 %.

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