Nitrogen-doped carbon nanofiber webs (CNFWs) with high surface areas are successfully prepared by carbonization-activation of polypyrrole nanofiber webs with KOH. The as-obtained CNFWs exhibit a superhigh reversible capacity of 943 mAh g−1 at a current density of 2 A g−1 even after 600 cycles, which is ascribed to the novel porous nanostructure and high-level nitrogen doping.
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