通过炭化和进一步KOH化学活化的方法制备了聚酰亚胺基炭材料, 并将其用作双电层电容器电极材料. 采用DFT、XPS方法对其孔结构和表面化学性质进行了研究, 并通过恒流充放电等方法探讨了其电化学特性. 结果表明: 样品CPI的质量比电容是双电层电容和表面氮原子(尤其是N-5)所提供的赝电容共同作用的结果. 经活化后, 样品API比表面积达到1941m2/g, 主要形成0.7～2.0nm之间的微孔, 氮原子的影响可以忽略, 在50mA/g的放电电流密度下质量比电容达300F/g, 且电流密度达到1000mA/g时, 电容保持率仍为86.1%; 交流阻抗测试也表明样品API具有良好的双电层电容特性, 是一种新型的双电层电容器电极材料.
Polyimide derived activated carbon was prepared by carbonization and KOH activation, which was used for electrode material of electric double-layer capacitors. Its pore structure and surface chemical property were studied by DFT and XPS, respectively, and its electrochemical properties were studied by electrochemical methods, such as, charge-discharge of constant current. The results show that both the nitrogen content and the porosity of sample CPI affect its gravimetric capacitance. After activation, the specific areas of sample API reach 1941m2/g, the micropore formed is all less than 2nm. The effect of nitrogen atom can be ignored. Its gravimetric capacitance reach 300F/g with the discharging current density of 50mA/g, and remain 86.1% of its capacitance when the current density reaches 1000mA/g. The results of impedance also show that sample API has good electric double-layer performance which is novel electrode material for electric double layer capacitor.
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