▎ 摘　　要

NOVELTY - A supercapacitor comprises a positive electrode, a negative electrode and an electrolyte. The positive electrode is nickel cobaltate/graphene foam. The negative electrode is nitrogen carbon/graphene foam. The electrolyte is polyvinyl alcohol/potassium hydroxide gel. The positive and negative electrodes are double helix layered porous graphene foam electrode. USE - Supercapacitor. ADVANTAGE - The supercapacitor including three-dimensional graphene foam with ordered inner structure has increased specific surface area, facilitates the transmission of electron/ion, and improves the integrity of the structure. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the supercapacitor.