Journal
ACS NANO
Volume 9, Issue 11, Pages 11225-11233Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b04821
Keywords
egg-box; small mesopores; porous carbon; high-rate performance
Categories
Funding
- Shanghai Science and Technology Committee [15ZR1422400, 14JC1403300, 14520710100]
- Research Fund for the Doctoral Program of Higher Education of China [20120073130001]
- SMC-Chen Xing Young Scholar Award of SJTU
- Program for New Century Excellent Talents in University, Ministry of Education, China
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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.
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