▎ 摘　　要

2D porous carbon nanosheets (PCNs) occupy the foreground in the field of electric double-layer capacitors (EDLCs). However, the mass production of PCNs with ultrathin thicknesses is still a serious challenge. Herein, PCNs constructed of few-layer graphene sheets were synthesized from a sulfonated pitch (SP) carbon precursor and soft-template F127 by a "medium-up" strategy. SP serves as a "medium material", while F127 acts as a "string" and "spacer", which plays the leading role of structure directing and prevents the self-restacking of small graphene layers. After activation, sample PCN6 with high carbon yield is constructed with a thickness of only 1.3 nm, sufficient specific surface area of 3006 m(2) g(-1) and high e-conductivity of 135 S m(-1). By virtue of its unique architecture, the PCN6-based EDLC exhibits excellent energy storage properties. In EMIMBF4 electrolyte, it demonstrates an ultrahigh C-g of 157.8 F g(-1) (57.4 F cm(-3)) at 20 A g(-1), possessing a top-level rate capacity C-2010.05 of 86.7%. Simultaneously, its energy density can retain up to 67.1 W h kg(-1) at a high power density of 17.5 kW kg(-1). The ingenious structural design of PCNs can afford inspiration for constructing other 2D architecture carbon materials.