Preparation of Nitrogen-Doped Carbon Nanonets for High-Performance Supercapacitors

Herein, nitrogen-doped carbon nanonets (NCNs) were successfully prepared through one-step carbonization/activation method by using phenanthrene as carbon source and NH3 as nitrogen source. The sample obtained at 800 degrees C (NCN(80)0) possessed a unique network structure, large specific surface area (1 567 m(2).g(-1)) and high atomic fraction of N (4.41%) and 0 (13.71%) elements. Thanks to these structural features, NCN800 exhibited high specific capacitance (542.3 F.g(-1) at 0.05 A.g(-1)) in a three-electrode sysiem as a working electrode. In addition, NCN800 electrode for symmetric supercapacitor exhibited high specific capacitance (443.6 F.g(-1) at 0.05 A.g(-1)), good rate capability (341.2 F.g(-1) at 20 A.g(-1)) and outstanding cycling stability (93.5% capacitance retention after 30 000 cycles).