The Performance Of The Electrode Surface Chemically Modified Coatings

Optimum polymerization potential and surface properties were studied. Two different preparation methods of conducting polypyrrole (PPy) with special morphology were employed.Linear sweep voltammetry (LSV) was adopted to obtain conducting PPy chemically modified electrodes under same conditions. Optimum polymerization potential of 0.6 V~1.0 V was confirmed by analyzing the curve characteristics. Effect of polymerization condition on surface contact angle of conducting PPy chemically modified electrodes, such as dopants, polymerization time, polymerization potential, monomer concentration and dopant concentration were studied. It demonstrated that the PPy film which was formed by electrolysis of 0.4 mol/L pyrrole in 0.5 mol/L aqueous dopant solution at 0.7 V for 120 s has the minimum contact angle, which indicating that the obtained PPy film had the best hydrophilic properties under this condition. Special surface morphology of micro-tentacle which was different from ordinary cauliflower morphology of PPy was obtained and it revealed that the optimal polymerization condition to get the micro-tentacle morphology was electrolysis of 0.2 mol/L pyrrole in 0.2 mol/L aqueous dopant solution at 1.0 V for 1600 s. In addition, non-template method was employed to obtain PPy with micro-tentacle morphology and its electrochemical properties were studied. It revealed that the PPy film which was obtained in an aqueous solution of 0.2 mol/L pyrrole and 0.1 mol/L dopant at 0.6 V for 120 min had the largest surface area and the optimum electrochemical properties.