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

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 RE 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.