Poly(anilin-co-pyrrole)(PANPY)was synthesized on A304 stainless steel by the cyclic voltmmetric method from aniline/pyrrole with H2SO4 and p-TSA as dopant.The composition and morphology of PANPY films synthesized by different mole ratios of aniline/pyrrole were characterized by Fourier transfered infared spectroscopy(FT-IR)and scanning electron microscopy(SEM).The supercapacitor performance of the PANPY films were also investigated in 0.5 mol·L-1 H2SO4 solution with cyclic voltammetry(CV)cycling in the range of-0.2 V to 0.7 V(vs SCE)

charge/discharge tests and electrochemical impedance spectroscopy(EIS).The results showed that more pyrrole units were incorporated into the PANPY films when the concentration of pyrrole increased.The surface of PANPY(1/1)films synthesized from aniline/pyrrole(1:1 mole ratio)was mainly mushroom-like spheres with some network structure.The PANPY(1/1)films displayed much higher ion exchange capacity

better stability and excellent supercapacitor performance than PANPY(1/2)and PANPY(2/1).The charge transfer resistance of the PANPY(1/1)films was as low as 1.97 Ω

and the specific capacitance was up to 227.88 F·g-1.