Study on polypyrrole as an electrode material in neutral solutions

A study of the polypyrrole (PPy) as an electrode material for cathodic redu ction of dioxygen in water solutions depending on the substrate material wa s carried out. It has been found that the electroactivity of a PPy film str ongly depends on the nature of a substrate, especially if the thickness of the PPy film is low. The efficiency coefficient of the dioxygen reduction o n the Ni/PPy electrode is higher than the one on the Pt/PPy electrode and a chieves 84%. The electroactivity of PPy him falls as a result of cathodic p olarization, but it can be regenerated by short anodic polarization pulse. The stability of the PPy film in 0.1 M NaCl is higher than in 0.1 M Na-2 SO 4. (C) 1998 Elsevier Science Ltd. All rights reserved.