Electric double layer capacitance on hierarchical porous carbons in an organic electrolyte
Electric double layer capacitance on hierarchical porous carbons in an organic electrolyte
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DOI：
10.1016/j.jpowsour.2007.09.037
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发表时间：
2008-01
影响因子：
9.2
通讯作者：
Hirotoshi Yamada;I. Moriguchi;T. Kudo
中科院分区：
文献类型：
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作者：
Hirotoshi Yamada;I. Moriguchi;T. Kudo
以胶体晶体为模板制备纳米多孔碳。氮气吸附/解吸等温线和透射电子显微镜图像表明，多孔碳表现出具有介孔/大孔和微孔的分级多孔结构。在碳酸丙烯酯和二甲氧基乙烷中的 1M LiClO4 有机电解质中研究了多孔碳的双电层电容器性能。分级多孔碳表现出约约的大比双层电容。 120Fg−1，因为它们的表面积很大。此外，在高达10Ag−1的大电流密度下仍能获得大电容，满足混合动力汽车等高功率应用的需求。分层多孔结构的电容分析表明介孔/大孔和微孔对双电层电容的贡献分别为8.4和8.1μFcm−2。结果表明，即使溶剂化离子大于孔径，也会形成双电层。
Nanoporous carbons were prepared by using colloidal crystal as a template. Nitrogen adsorption/desorption isotherms and transmission electron microscope images revealed that the porous carbons exhibit hierarchical porous structures with meso/macropores and micropores. Electric double layer capacitor performance of the porous carbons was investigated in an organic electrolyte of 1M LiClO4in propylene carbonate and dimethoxy ethane. The hierarchical porous carbons exhibited large specific double layer capacitance of ca. 120Fg−1due to their large surface areas. In addition, the large capacitance was still obtained at a large current density up to 10Ag−1, which satisfies demands from the high power application such as hybrid electric vehicles. Capacitance analysis of the hierarchical porous structures revealed the contribution of meso/macropores and micropore to the electric double layer capacitance to be 8.4 and 8.1μFcm−2, respectively. The results indicated electric double layer is formed even when solvated ions are larger than pore diameters.