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Nanostructured films of polyaniline were successfully synthesised using electrodeposition technique on stainless substrates. Fourier transform infrared spectroscopy, and X-ray diffraction investigation indicated that the electrodeposited polyaniline was an emeraldine phase. The influence of electrodeposition potentials on morphology, Brumauer-Emmet-Teller surface area and impedance values of the films were determined based on a scanning electron microscope, surface area analyser, and electrochemical impedance spectroscopy measurements, respectively. The films were composed by nanofiber polyaniline with diameter range from 10 to 60 nm. An increase of electrodeposition potential reduced the polyaniline diameter that produced high surface area films which resulted in high specific capacitance and low impedance values. This work shows the role of electropolymerization potential in controlling the necessary properties of the electrodeposited polyaniline films.