Ex-situ nitrogen-doped porous carbons as electrode materials for high performance supercapacitor

摘要: Abstract Nitrogen (N) doping of porous carbon materials is an effective strategy for enhancing the electrochemical performance electrode materials. Herein, we report on ex-situ (post) nitrogen-doped carbons prepared using a biomass waste, peanut shell (PS) as source and melamine nitrogen source. The synthesis method involved two-step mechanism, initial chemical activation PS KOH post N-doping activated carbon. effect activating agent/precursor ratio structural, textural, properties was studied. N-doped with optimum amount to exhibited best capacitance specific surface area (SSA) 1442 m2 g−1 enriched content (3.2 at %). fabricated symmetric device 251.2 F g−1 per gravimetric current 1 A g−1 in aqueous electrolyte (2.5 M KNO3) wide cell voltage 2.0 V. A energy 35 Wh kg−1 corresponding power 1 kW kg−1 delivered still retaining up 22 Wh kg−1 20 kW kg−1 even 20 A g−1. Moreover, long term stability 83.2% capacity retention over 20 000 charge/discharge cycles also good rate capability after 180 h floating 5 A g−1. This great supercapacitor can be correlated porosity nitrogen-doping which increased electrochemically-active sites resulting remarkable charge storage capability.