Electrochemical capacitor with chemically polymerized conducting polymer based on activated carbon as hybrid electrodes

ACP/PAn hybrid electrodes for surpercapacitors were fabricated by adsorption of aniline monomers on the surface of activated carbon powders (ACP) and their polymerization by using a chemical method. Their capacitance performances were investigated in the 1M H2SO4 aqueous electrolyte solution by means of cyclic voltammetry and impedance spectroscopy. The cyclic voltammetric results showed that the ACP/PAn electrodes gave an increased specific capacitance value of 273 F/, which was larger than the capacitance of the ACP, approximately 193 F/g. However, impedance spectroscopic data showed better response time and higher frequency capacitance performance in ACP than ACP/PAn electrodes. This result means that the redox reaction of PAn is rate-determined step and can not contribute for charge storage at high frequency range over 1 Hz.