Fluorine and nitrogen co-doped mesoporous carbon derived from polytetrafluoroethylene@melamine sponge for supercapacitor application

摘要

By using polytetrafluoroethylene@melamine sponge composite as the precursor, a nitrogen and fluorine co-doped porous carbon is prepared via a chemical etching process. The specific surface area and total volume of the mesoporous carbon are 1799 m(2) g(-1) and 1.48 m(3) g(-1), respectively. The doping amount of the fluoride and nitrogen in the resulting co-doped carbon is determined to be 1.2 at.% and 2.7 at.%, respectively. In a threeelectrode system in 6 M KOH electrolyte, when mass loading of active material is 4 and 6 mg, electrodes deliver specific capacitances of 299 and 284 F g(-1) at a current density of 1 A g(-1), respectively. In a symmetricelectrode system in the same electrolyte, an electrode shows the specific capacitance of 233 F g(-1) at the same current density. In aqueous electrolyte, the assembled simulated supercapacitor reaps a maximum specific energy of 8.3 W h kg(-1) at a specific power of 101 W kg(-1). Under the current density of 5 A g(-1), after 6000 cycles, the 94.1% remaining capacitance indicates a good cycle stability. Findings demonstrate the synthesized fluorine and nitrogen co-doped porous carbon can be used as electroactive material for high-performance supercapacitor.