Taking H_2SO_4 and HNO_3 respectively as electrolyte for polymerization,the protonic aciddoped polypyrrole(PPy)was polymerized with cyclic voltammetry on stainless steel mesh.Its structure and morphology was characterized by means of Fourier transform infrared(FT-IR)spectrography,X-ray diffraction(XRD),and field-emission scanning electron microscopy(SEM).The electrochemical properties of electrode material were tested with cyclic voltammetry(CV),galvanostatic charge-discharge(GCD)method,and electrochemical ...