Sustainable electrode material for high-energy supercapacitor: biomass-derived graphene-like porous carbon with three-dimensional hierarchically ordered ion highways

Graphene-like porous carbon with fine-tuned 3D ion highways was synthesized from orange-peel wastes. The obtained energy and power density values are comparable to those of commercial high-performance supercapacitors as well as lead-acid and nickel-metal hybrid batteries.