"Egg-Box"-Assisted Fabrication of Porous Carbon with Small Mesopores for High-Rate Electric Double Layer Capacitors
"Egg-Box"-Assisted Fabrication of Porous Carbon with Small Mesopores for High-Rate Electric Double Layer Capacitors
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DOI：
10.1021/acsnano.5b04821
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发表时间：
2015-11-01
期刊：
影响因子：
17.1
通讯作者：
Zhang, Di
中科院分区：
文献类型：
--
作者：
Kang, Danmiao;Liu, Qinglei;Zhang, Di
在这里，我们报道了一种方法，通过简单地活化海藻碳化产生的由“蛋盒”模型形成的微晶区组成的木炭来制备具有2-4 nm小介孔的多孔炭。中孔的存在使木炭的比表面积高达3270m(2)g(-1)，其中95%的比表面积是由小孔提供的。这种特殊的孔结构在用作双电层电容器电极材料时表现出很高的适应性，特别是在高充放电倍率下。在1M H_2SO_4和1M TEA BF_4/AN中，多孔炭的质量比容值分别为425和210F·g(-1)，体积比容值分别为242和120F·cm(-3)。在水溶液和有机电解液中，100Ag(-1)和50Ag(-1)时的电容分别保持在280Fg(-1)(160F cm(-3))和156Fg(-1)(90F cm(-3))，表现出优异的高倍率电容性能。
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.