Polyaniline films on Ti-based metal substrates with granular

fibrillar and tube-slice surface morphology were prepared in a 0.2 mol·L-1 aniline solution in 0.5 mol·L-1 sulfuric acid by using the cyclic voltammetry method with scanning valtages in the range of -0.1 V～0.9 V at a scanning rate of 50 mV·s-1.The electrochemical properties and structure of polyaniline film electrodes were characterized by SEM

cyclic voltammetry(CV) and electrochemical impedance spectra (EIS).The result show that the different surface morphology of polyaniline films has different nucleation and growth mechanism

and polyaniline on Ti-based metal has prodigious surface area and good electrical conductivity.The tube-slice polyaniline has the least film impedance and the best electrical conductivity.