Effects of Electrolyte Solutions on Overoxidation of Polypyrrole During Its Electrochemical Polymerization

doi:10.3969/j.issn.0251-0790.2012.01.021

Abstract

Abstract: Polypyrrole(PPy) was prepared by cyclic voltammetry on a platinum electrode in H₂SO₄/H₂O and LiClO₄/CH₃CN solutions, respectively. The effects of electrolyte solutions on overoxidation of polypyrrole during its electrochemical polymerization were studied by in situ spectroelectrochemical measurements. Compared with the solution of H₂SO₄/H₂O, the overoxidative peak potential of polypyrrole in LiClO₄/CH₃CN was positively shifted by 0.42 V. The results show that the β-C of the pentacycle is oxidized to oxygen-containing groups such as C—OH and CO during the overoxidation of polypyrrole at high potentials. Polypyrrole partially degraded with the formation of CO₂ in H₂SO₄/H₂O solutions, which resulted in loss of conductivity, and did not obviously degrade during overoxidation in the solution LiClO₄/CH₃CN at the higher potentials.

Key words: Polypyrrole, Electrochemical polymerization, Overoxidation, Electrolyte solution, In situ FTIR

CLC Number:

TrendMD:

LI Mei-Chao, ZHU Wan-Xia, ZHU Jing-Na, MO Wei-Min. Effects of Electrolyte Solutions on Overoxidation of Polypyrrole During Its Electrochemical Polymerization[J]. Chem. J. Chinese Universities, 2012, 33(01): 128.

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