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海藻做活性炭应用于超电
A
R
T
“Egg-Box”-Assisted Fabrication of
I
Porous Carbon with Small Mesopores C
for High-Rate Electric Double Layer L
E
Capacitors
Danmiao Kang, Qinglei Liu,* Jiajun Gu, Yishi Su, Wang Zhang, and Di Zhang*
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, Peoples Republic of China
ABSTRACT Here we report a method to fabricate porous carbon with small mesopores around
24 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 m2 g1, 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 chargedischarge rate. The gravimetric
capacitance values of the porous carbon are 425 and 210 F g1 and volumetric capacitance values
are 242 and 120 F cm3 in 1 M H SO and 1 M TEA BF
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