Influence of water addition on the electrochemical behavior of polypyrrole synthesized in organic solution

Using potential step method, polypyrrole films were synthesized directly on the surface of Pt micro-disk electrode in 0.1 mol/L pyrrole-0.1 mol/L LiClO4-PC solution containing different proportion of water(0, 2%, 4%, 6%, 8%, in volume fraction). The electrochemical properties of polypyrrole film electrodes were characterized with the methods of cyclic voltammetry(CV) and chronoamperometry, the morphologies of films were observed by scanning electron microscope(SEM) as well. It is shown that the addition of 6% water is the one which is favorable to PPy electro-deposition and its characteristics. Besides more compact surface, polypyrrole film synthesized in this condition exhibits better redox reversibility and higher capacity.