High rate performance porous carbon prepared from coal for supercapacitors

Porous carbon with high specific surface areas up to 1851m²g^‑1 was prepared from coal by chemical activation. The specific capacitance of the porous carbon reaches 258Fg^‑1 at a current density of 1Ag^‑1 with about 81% capacitance retention at a current density of 30Ag^‑1. The porous carbon exhibits good cycling durability with 92% specific capacitance retained at a current density of 2Ag^‑1 after 1000 cycles.