以热固性酚醛树脂为前驱体, 采用水蒸汽为活化剂, 通过改变活化时间, 制备出了一系列双电层电容器用活性炭(PFR(1-5)). 采用低温氮气吸附法测定BET比表面积和孔结构, 发现随着活化时间的增加, 活性炭的比表面积和中孔率增 大. 电化学测试表明, 用活化时间为5h的PFR5H制备的模拟EDLC的比电容, 在有机体系中50mA/g恒 流放电比电容达106.5F/g, 1000mA/g下放电仍保持99.7F/g, 仅衰减了6.4％, 具有良好的倍率特性. 交流阻抗谱测试结果显示PFR5H的内阻最低, 具有良好的电容性能和功率特性.
Activated carbon for electric double-layer capacitor(EDLC) application was prepared by steam activation of resole phenolic formaldehyde resin through changing the activating time(PFR(1-5H). The BET specific surface area and pore structure parameter f all samples obtained were determined by the low temperature gas adsorption isotherm. It is found that the BET specific surface area and the mesopore ratio of the activated carbon are increased with the activating time increasing. The electrochemical test indicates that the model EDLC prepared by PFR5H (5h activating time) shows the highest specific capacitance of 106.5F/g in organic system with the constant discharge current of 50mA/g. When the constant discharge current is 1000mA/g, its specific capacitance remains 99.7F/g and only decreases 6.4％ in the same system. And the model EDLC prepared by PFR5H shows good rate capability. AC impedance analyses show that the model EDLC prepared by PFR5H has the lowest resistance, so it has remarkable specific capacitance and good power capability.
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