Bimetallic-organic coordination polymers to prepare N-doped hierarchical porous carbon for high performance supercapacitors

Single metal-organic coordination polymers have limited functions as precursors for porous carbon electrode materials. The construction of bimetallic organic coordination polymers can effectively utilize the advantages of each single metal-organic coordination polymer to improve the performance of the derived carbon materials. Herein, High performance nitrogen-doped porous carbon (BC_Fe–_Ni) have been produced by directly carbonizing bimetallic organic coordination polymers formed by 4,4′-bipyridine (BPD) reaction with FeCl₃ and NiCl₂. The BC_Fe–_Ni exhibits high nitrogen content (12.66 at%), large specific surface area (1049.51 m² g⁻¹) and hierarchical porous structure, which contributes to an excellent gravimetric specific gravity of 320.5 F g⁻¹ and 108% of specific capacitance retention after 10000 cycles. The BC_Fe–_Ni assembled symmetrical supercapacitor shows an energy density of 18.3 W h kg⁻¹ at a power density of 350 W kg⁻¹. It is expected that the as-prepared N-doped porous carbon derived from bimetallic-organic coordination polymer is a promising electrode material for high performance energy storage devices.