Nitrogen-rich hierarchical porous hollow carbon nanofibers for high-performance supercapacitor electrodes

Abstract

Nitrogen-rich hierarchical porous hollow carbon nanofibers (HPCNFs) were synthesized by concentric electrospinning and subsequent KCl/K₂CO₃ activation. The obtained HPCNFs have quite high nitrogen content (14.4 wt%) and rational hierarchical porous structure, thus exhibiting a high specific capacitance of 293 F g⁻¹, a superior specific areal capacitance of 40 μF cm⁻² at 0.2 A g⁻¹ and an excellent rate capability of 62.8% (185 F g⁻¹) at 50 A g⁻¹ in 6 M KOH electrolyte.