State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University , Shanghai 200240, People's Republic of China.
ACS Nano. 2015 Nov 24;9(11):11225-33. doi: 10.1021/acsnano.5b04821. Epub 2015 Oct 5.
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.
在这里，我们报告了一种通过简单地激活由海藻碳化得到的木炭来制备具有 2-4nm 左右小孔的多孔碳的方法，这些海藻由“蛋盒”模型形成的微晶畴组成。木炭中存在介孔导致其比表面积高达 3270 m(2) g(-1)，其中 95%的表面积由小孔提供。这种特殊的孔结构在用作双电层电容器的电极材料时具有很高的适应性，特别是在高充放电速率下。在 1M H2SO4 和 1M TEA BF4/AN 中，多孔碳的比电容值分别为 425 和 210 F g(-1)，体积电容值分别为 242 和 120 F cm(-3)。在水相和有机电解液中，即使在 100A g(-1)时仍保持 280 F g(-1)（160 F cm(-3)），在 50A g(-1)时仍保持 156 F g(-1)（90 F cm(-3)），表现出优异的高倍率电容性能。
