Graphene foam

Both electrodes were lightweight and their large surface area provided high energy density of 110 Wh/kg, comparable to commercial batteries.

The latter material supports 3,000 times its own weight and can return to its original shape when unweighted.

Nanotubes, a powdered nickel catalyst and sugar were mixed.

Dried pellets of the substance were then compressed in a steel die in the shape of a screw.

The nickel was removed, leaving a screw-shaped piece of foam.

Schematic of the synthesis of graphene foam using a Ni template (top) and photographs of the products (bottom)
Electron micrographs of the graphene foam prepared using a Ni template