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水牛生态学家

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专业: 电化学

[交流] 大牛Di Zhang最新超级电容器力作（ACS Nano，2015年10月06日）已有1人参与

题目：“Egg-Box”-Assisted Fabrication of Porous Carbon with Small Mesopores for High-Rate Electric Double Layer Capacitors

作者：Danmiao Kang, Qinglei Liu*, Jiajun Gu, Yishi Su, Wang Zhang, and Di Zhang* （上交大牛）
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China

摘要：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 m2 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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