Effects of Different Acids Dopant on Electrochemical Properties of Polyaniline Nanofibers

Polyaniline (PANI) nanofibers with average diameter of about 50, 62 nm and 95 nm were respectively synthesized by interfacial polymerization method in the presence of different kinds of doped acids. The chemical composition and micromorphology of PANI nanofibers were characterized by FT IR, SEM and TEM. The electrochemical supercapacitor behaviors of PANI nanofibers doped with different proton acids were examined through Cyclic Voltammetry (CV), galvanostatic charge discharge and Electrochemical Impedance Spectroscopy (EIS). And the microstructure of PANI nanofibers was further stu died by means of XRD, nitrogen adsorption desorption isotherms and XPS. Results show that the specific capacitance of PANI doped with perchloric acid (HClO4) is up to 397 F/g at the current density of 0.5 A/g, which is much higher in comparison with those doped with hydrochloric acid (HCl, 334 F/g) and camphorsulfonic acid (HCSA, 383 F/g). The electrochemical properties of PANI nanofibers are mainly affected by its regularity, porosity and doping degree.