Flexible quasi-solid-state planar micro-supercapacitor based on cellular graphene films

Quasi-solid-state micro-supercapacitors with cellular graphene film as the active material and polyvinyl alcohol/H₃PO₄as the gel electrolyte have been fabricated. The 3D porous graphene films not only serve as high performance supercapacitor electrodes, but also provide an abundant ion reservoir for the gel electrolyte.