Coprinus Comatus-Based Nitrogen-Doped Active Carbon for High Performance Supercapacitor

Coprinus comatus-based nitrogen-doped activated carbon (N-ACC) is prepared by chemical activation and nitrogen-doped methods. The N-ACC possesses large specific surface areas (976.96m(2) g(-1)), high nitrogen contents (11.53 wt.%), and super hydrophilicity. As electrodematerial for supercapacitors, the N-ACC shows remarkable electrochemical performance, such as 346 Fg(-1) maximum specific capacitance at a current density of 1 Ag-1, which retains 260F g(-1) even at a high current density of 10 A g(-1) (about 75% capacitance retention) in 2 M KOH aqueous electrolyte. The assembled N-ACC//N-ACC symmetric supercapacitor exhibits energy density of 14.63 Wh kg(-1) at power density of 810 W kg(-1), and excellent cycling stability with 92% specific capacitance retention after 10000 cycles in the voltage range 0-1.8V in 0.5M Na2SO4 aqueous solution. These results indicate that the N-ACC as electrode materials can be used for high performance supercapacitors.