Electrochemical performance of polypyrrole electrode electropolymerized in organic solution containing different proportion of water

Polypyrrole electrodes were prepared in 0.1mol/L Py-0.1mol/L LiClO₄^- propylene carbonate (PC) solutions containing different proportion of water (0, 1%, 2%, 3%, 4%, by volume) through galvanostatic electropolymerization. The electrode properties of polypyrroles synthesized in the solutions containing different proportion of water were investigated with cyclic voltammetry as well as electrochemical impedance spectra (EIS). The morphologies of PPy synthesized in the solutions without/with water (1%) were observed by scanning electron microscope(SEM). Electrochemical performance of PPy electrodes was studied with galvanostatic charge-discharge method. It is shown that the addition of water into polymerization solutions lowers the polymerization potential of PPy, in particular, leads to an improvement of PPy electrode performance. It is found that the PPy electrode electropolymerized under the condition of containing 1% of water displays better electrochemical performance on reversibility, cycleability and charge-discharge efficiency among various PPy electrodes examined in this work, relatively.