Nitrogen and Boron Co‐Doped Porous Carbon Nanosheets for High Performance Supercapacitor

ABSTRACT Porous carbon nanosheets possess a short ion diffusion distance and low ion diffusion resistance, demonstrating great potential as electrode materials for supercapacitors. Herein, we report a simple strategy to synthesize nitrogen and boron co‐doped porous carbon nanosheets by electrostatic self‐assembly of polyacrylamide and graphene oxide, followed by carbonization using ammonia borate as nitrogen and boron source. The optimized porous carbon nanosheets (NBPC‐800) have a unique two‐dimensional porous structure, high specific surface area, and abundant nitrogen and boron functional groups. The prepared electrode materials exhibit good electrochemical performance with a specific capacitance of 330.3 F g −1 at 0.5 A g −1 and superior electrochemical stabilization. Notably, the constructed NBPC‐800//NBPC‐800 symmetric supercapacitor displays an energy density of 24.9 Wh kg −1 and superior electrochemical stabilization.