High-energy supercapacitors based on hierarchical porous carbon with an ultrahigh ion-accessible surface area in ionic liquid electrolytes

• DOI: 10.1039/c3nr00738c
• Publication Date: 2013-04-08T08:32:03Z
• Authors: Hui Zhong; Fei Xu; Zenghui Li; Ruowen Fu; Dingcai Wu
• Keywords: Power density; Nanopore; Specific surface area; Carbon fibers; Energy density; Polystyrene

A very important yet really challenging issue to address is how greatly increase the energy density of supercapacitors approach or even exceed those batteries without sacrificing power density. Herein we report fabrication a new class ultrahigh surface area hierarchical porous carbon (UHSA-HPC) based on pore formation and widening polystyrene-derived HPC by KOH activation, highlight its superior ability for storage in with ionic liquid (IL) as electrolyte. The UHSA-HPC more than 3000 m2 g−1 shows an extremely high density, i.e., 118 W h kg−1 at 100 kg−1. This ascribed unique nanonetwork structure large number small-sized nanopores IL ideal meso-/macroporous network transfer.