Nitrogen and Oxygen Co‐doped Hierarchical Porous Carbon: Electrode Materials for High‐Energy Density and Flexible Solid‐State Supercapacitors

Abstract Nitrogen and oxygen co‐doped hierarchically porous carbons (NO−HPCs) with robust tailored pore structures were fabricated through a soft chemistry synthetic strategy involving the use of F127 and the Friedel‐Crafts alkylation reaction, referred to as NO−HPC−FH. The obtained carbon of NO−HPC−FH has rich nitrogen and oxygen contents, high surface area (up to 1715 m 2 /g), wider range pore‐size distribution, and high pore volume (up to 2.8 cm 3 /g). Herein, NO−HPC−FH exhibits a high specific capacitance of 382 F/g at 0.5 A/g and an excellent cycling stability after 15 000 cycles at 20 A/g (capacitance retention is nearly 100 %), in which the contribution of the pseudocapacitance to the total specific capacitance was found to reach about 78 %. In particular, an all‐solid‐state flexible supercapacitor was fabricated, which also exhibited a high energy density of 33.4 Wh/kg at the power output of 879.9 W/kg, and a high cycling stability and flexibility. Therefore, this synthetic protocol using soft templates provides an alternative strategy to synthesize heteroatom‐doped HPCs based on “knitted” aromatic subunits and, thus, has promising potential for application in supercapacitive materials.