【摘要】 以永城天然焦为前驱体,KOH为活化剂制备高比表面积活性炭,并将其作为超级电容器的电极材料.采用N2吸附和X射线衍射(XRD)对活性炭的比表面积、孔结构及微晶结构进行了表征,用恒流充放电、循环伏安和交流阻抗等电化学测试手段评价了其电化学特性.在碱炭比为4∶1,800℃活化1h的条件下制备出比表面积2441m2/g,孔容1.5cm3/g,中孔率67%的活性炭.该活性炭电极在3MKOH水溶液及1M(C2H5)4NBF4/碳酸丙烯酯(PC)电解液中具有高的比电容(分别达到252F/g,163F/g),低的扩散阻抗(分别为0.5Ω和6.8Ω).更多还原

【Abstract】 Natural coke from Yongcheng was activated by KOH to prepare high-performance activated carbons as electrodes for electric double-layer capacitors(EDLCs).Specific surface area and pore structure of activated carbons was investigated and their EDLC properties were measured in 3 M KOH aqueous solution and 1 M(C2H5)4NBF4/propylene carbonate(PC)solution.The as-prepared activated carbons exhibit large surface areas(2 441 m2/g),high capacitances(252 F/g in 3 M KOH aqueous electrolyte,163 F/g in 1 M(C2H5)4NBF4/PC electrolyte)and low AC impedance.更多还原