微孔-介孔多级孔炭材料的制备及电化学电容性能研究

Preparation of Micro-meso Hierarchical Porous Carbon and Studies in Its Electrochemical Capacitive Performances

采用有机-有机自组装法,并结合后活化法制备了一类具有微孔-介孔复合孔结构的多级孔炭材料(HPC),并研究了这类材料的电化学电容性能.孔结构测试表明,采用KOH后活化法可以在介孔炭的孔壁上控制性地生成微孔.电化学测试表明,与文献中报道的硬模板法制备的介孔炭相比,HPC具有更好的电化学电容性能.在100mV/s的快速电压扫描速率下,它的比电容值能达到168.9F/g.更值得指出的是,HPC的高频电容性能非常优异,在1Hz时的比电容值高达180F/g,这一数值优于任何其它类的电极材料.HPC优异的电化学电容性能应当归功于它特殊的多级孔结构,有助于电解质离子在孔道内的快速扩散.

A kind of micro-meso hierarchical porous carbon （HPC） was prepared by a combination of organic-organic self-assembly approach and post-activation approach, and also investigated as an electrode material in electrochemical capacitors. Pore structure analysis shows that micropores can be adjustably generated on the mesopore wall of mesoporous carbon （MC） by post activation at high temperature using KOH as an activating agent. As evidenced by electrochemical measurements, HPC shows superior capacitive behavior （exhibiting a high capacitance of up to 168.9 F/g even at a very high sweep rate of 100 mV/s） to hard-templated carbon reported in the literature. Of special interest is the fact that HPC has very excellent capacitance at high frequency of 1 Hz, reaching up to 180 F/g that is the highest value than any other electrode material reported in the literature. The excellent capacitive performance of HPC can be ascribed to its unique hierarchical porous structure that favors the fast diffusion of electrolyte ions in its pore structure.