LAUSR

Abstract Hybrid supercapacitors, due to the synergistic effect of each composition, show higher specific capacitance and improved cycle stability compared with most traditional supercapacitors. In this work, multicomponent compound NiCo pyrophosphate/nitrogen doped carbon (NiCoPN/C) is elaborately designed and applied as the electrode for hybrid supercapacitors. The obtained sample possesses a hierarchically porous structure with surface area of up to 341.7 m2 g−1. In the electrochemical test, the sample gives a specific capacitance of 1240 F g−1 at the current density of 1 A g−1. The asymmetric supercapacitor NiCoPN/C-5//AC exhibits a high specific energy of 44.68 W h kg−1 when specific power is 715 W kg−1. After 10000 cycles, the specific capacitance retention of the capacitor remains at 83.7%.