De-doped polyaniline nanofibres with micropores for high-rate aqueous electrochemical capacitor

Polyaniline nanofibres have been prepared without any template or surfactant. Although the morphology of polyaniline is well kept after dealing with aqueous ammonia, de-doped polyaniline nanofibres with micropores are of better electrochemical capacitor performances in 1 M H2SO4 aqueous solution. Its specific capacitance is 593 F g−1 at a constant current density of 2.5 A g−1, and can be subjected to charge/discharge over 5000 cycles in the voltage range of 0–0.65 V. Moreover, its capacitance retention ratio reaches circa 87% with the current densities increasing from 2.5 A g−1 to 15 A g−1.