New bicontinuous microporous/mesoporous carbon foam is proposed for supercapacitor.
An ultrahigh specific surface area of up to 3106.7 m2 g−1 is achieved for this carbon foam.
Hierarchical porous carbon material with super-large macropores (0.5–5 μm) is devised.
An efficient buried activation technique is introduced for the preparation of carbon foam.
The present carbon foam exhibits excellent performances for supercapacitor application.