The synthesis of nanostructured nitrogen-doped carbon via one-step rapid carbonization of metal-organic frameworks: Towards enhanced supercapacitor performance

摘要

The bimetal-organic frameworks (bi-MOFs) were used as a template for preparing nanoporous carbons (NPCs) by a novel annealing strategy combing rapid heating (300 degrees C/min) and direct activation at CO2 atmosphere. The prepared NPC-300-900 sample with high heating rate exhibited a higher specific surface area (652.36 m(2) g(-1)) and larger pore size (V-meso = 0.28 cm(3) g(-1)) than the normal annealed sample (heating rate 5 degrees C/min), which resulted in a higher capacitance and a superior rate capability. The results indicated that the NPC-300-900 samples showed excellent electrochemical properties in aqueous electrolyte. Its specific capacitance was 253 F g(-1) at 1.0 A g(-1), while the value could remain 120 F g(-1) even at 20.0 A g(-1). Therefore, this work may shed new light on designing novel porous carbon for supercapacitor applications.