Electropolymerization investigation of polyaniline films on ITO substrate

In this work, the study of the electrodeposition of polyaniline (PANI) on Indium Tin Oxide (ITO) substrate by cyclic voltammetry and chronoamperometry from an acidic medium (0.5 M H2SO4 + 0.01 M Aniline + 0.1 M Na2SO4) revealed that the PANI electropolymerization is a quasi-reversible reaction controlled by the diffusion process. The electrochemical performances investigation using cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge-discharge methods demonstrated that the PANI electrodeposited film is a pseudocapacitive material. The higher specific capacitance is about 21.76 mF cm−2 at a scan rate of 10 mV s−1, this value decreases increasing the scan rate. Similarly, the charge-discharge curves showed a specific capacitance of 9 mF cm−2 at 0.1 A cm−2.