▎ 摘　　要

Heteroatom-doped nanoporous graphene has great potential as emerging energy storage materials, but the complex synthetic routes and disordered structure limit the improvement of supercapacitance per-formance. Herein, we develop a one-step synthesis strategy to obtain nitrogen/sulfur doped nanoporous graphene (NS-NG). Graphene oxides absorbed with dyes are burned in a confined interlayer of porous hy-drotalcite for preparing NS-NG. Interestingly, the NS-NG retains the morphology of multilayer graphene oxides coated with fiber rods before combustion, so it exhibits the annual ring-shaped structure, larger surface area, and highly porosity. Importantly, the NS-NG not only shows a high specific capacitance of 325 F g(-1), and also has a high energy density of 25 Wh kg(-1) at a high power density of 1906 W kg(-1) with an excellent capacity retention of 86% after 10,000 cycles applied in the two-electrode symmetric super-capacitor at a current density of 2 A g(-1) in 0.5 M Na2SO4 aqueous solution. (C) 2021 Elsevier Ltd. All rights reserved.