Synthesis of Microscopic 3D Graphene for High‐Performance Supercapacitors with Ultra‐High Areal Capacitance

Despite graphene being considered an ideal supercapacitor electrode material, its use in commercial devices is limited because few methods exist to produce high-quality graphene at a large scale and low cost. A simple method is reported to synthesize 3D graphene by graphenization of coal tar pitch with a K