title: "Egg-Box"-Assisted Fabrication of Porous Carbon with Small Mesopores for High-Rate Electric Double Layer Capacitors.
abstract: Here we report a method to fabricate porous carbon with small mesopores around 2-4 nm by simple activation of charcoals derived from carbonization of seaweed consisting of microcrystalline domains formed by the "egg-box" model. The existence of mesopores in charcoals leads to a high specific surface area up to 3270 m(2) g(-1), with 95% surface area provided by small mesopores. This special pore structure shows high adaptability when used as electrode materials for an electric double layer capacitor, especially at high charge-discharge rate. The gravimetric capacitance values of the porous carbon are 425 and 210 F g(-1) and volumetric capacitance values are 242 and 120 F cm(-3) in 1 M H2SO4 and 1 M TEA BF4/AN, respectively. The capacitances even remain at 280 F g(-1) (160 F cm(-3)) at 100 A g(-1) and 156 F g(-1) (90 F cm(-3)) at 50 A g(-1) in the aqueous and organic electrolytes, demonstrating excellent high-rate capacitive performance.
authors.affiliation: State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University , Shanghai 200240, People's Republic of China.
authors.forename: Danmiao
authors.initials: D
authors.lastname: Kang
authors.affiliation: State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University , Shanghai 200240, People's Republic of China.
authors.forename: Qinglei
authors.initials: Q
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University , Shanghai 200240, People's Republic of China.
authors.forename: Jiajun
authors.initials: J
authors.lastname: Gu
authors.affiliation: State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University , Shanghai 200240, People's Republic of China.
authors.forename: Yishi
authors.initials: Y
authors.lastname: Su
authors.affiliation: State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University , Shanghai 200240, People's Republic of China.
authors.forename: Wang
authors.initials: W
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University , Shanghai 200240, People's Republic of China.
authors.forename: Di
authors.initials: D
authors.lastname: Zhang
keywords: egg-box; high-rate performance; porous carbon; small mesopores