Boosting Energy Storage Capability of Nitrogen‐Doped Hierarchically Porous Carbon by Graphitization

The construction of excellent electrochemical double‐layer capacitors (EDLCs) with high energy density is prospective but still challenging. Herein, a combined strategy of self‐template pyrolysis, KOH activation, and iron‐catalytic graphitization is developed to synthesize nitrogen‐doped hierarchically porous partially graphitic carbon (NHPGC) as electrodes material of EDLCs. The obtained NHPGC presents specific features: containing nitrogen element, hierarchically porous structure with a large surface area (2662 m 2 g −1 ), and graphitic structure. Attributed to the advanced design, the assembled NHPGC//NHPGC supercapacitor shows superior ion transport ability and remarkable cycle long life (96.9% retention after 20 000 cycles). The present strategy for nitrogen‐doped hierarchically porous partially graphitic carbon can be extended to apply for other high‐performance energy storage applications.