Effect of Electrochemical Synthesis Conditions on Capacitor Performance of Polyaniline Electrodes

Abstract: Polyaniline was electrochemically synthesized on stainless steel using sulfuric acid as the doping agent through cyclic voltammetry. The influences of the aniline monomer concentration and cycle number on electrochemical performance were investigated by cyclic voltammetry and the electrochemical impedance spectra. The results show that increasing aniline concentration leads to the increase of aniline electrochemical polymerization rate. The mass specific capacitance of polyaniline electrode increases with the increase of aniline concentration for 10 cycles and it reaches 769.55 F/g at the aniline concentration of 0.3mol/L. However, the capacitances of polyaniline prepared at different aniline concentrations display no apparent differences for 15 or 20 cycles. Furthermore, the capacitance decreases with the increase of cycling number. Electrochemical impedance spectroscopes show that the polyaniline keeps superior conducting performance in the potential range of 0.1V~0.4V