通过循环伏安法在多孔活性炭表面沉积了聚苯胺膜,并采用扫描电子显微镜、交流阻抗潜以及恒电流允放电技术对聚苯胺、活性炭和聚苯胺/活性炭复合电极进行了研究.结果显示:聚苯胺在活性炭表面形成一层由多孔网状结构组成的均匀的膜.聚苯胺/活性炭复合电极比活性炭电极具有更高的容量,同时比聚苯胺电极具有更好的循环稳定性.聚苯胺/活性炭复合电极的比电容为587F/g,而活性炭电极仅为140F/g.在50次充放电循环后,聚苯胺电极比电容从513降至334F/g,而聚苯胺/活性炭复合电极从415F/g下降为383F/g.
The performance of activated carbons coated with polyaniline (PANI-C) by polymerization of aniline using cyclic voltammetry was investigated as an electrode for supercapacitors by scanning electron microscopy, electrochemical impedance spectroscopy, and constant current charge/discharge measurement. Results showed that a PANI thin film was uniformly deposited on the surface of the activated carbon, forming an interlinked porous network. The PANI-C compos-ite electrodes had better cycling stability than PANI electrodes and the specific capacitance of the composite electrodes was 587 F/g, which was much higher than that of the pristine activated carbon ( 140F/g), owing to the faradic reaction of PANI with the electrolyte. The PANI electrode was less stable than the PANI-C composite electrode with a capaci-tance decay from 513 to 334F/g for the former and 415 to 385 for the latter, after 50cycles.
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