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.