Electrochemical process of formation of an insulating polypyrrole film

Tetsuya Osaka*, Toshiyuki Momma, Shin ichi Komaba, Himeko Kanagawa, Sadako Nakamura

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)


Insulating and electroinactive polypyrrole (PPy(NaOH)) film can be synthesized by electropolymerization from an NAOH aqueous solution containing pyrrole at a highly positive potential. The synthesis of this electroinactive PPy(NaOH) was investigated using in situ UV and X-ray photoelectron spectroscopy, and was compared with the irreversible oxidation ("overoxidation") of electroactive PPy under a highly positive potential. Overoxidation made the PPy inactive. However, the formation of PPy (NaOH) started above 0.5 V vs. Ag/AgCl, and the "overoxidation" began simultaneously in the polymerizing solution. Overoxidation with nucleophilic hydroxide ions caused a structural change in the PPy molecule, which destroyed the original π-conjugated system.

Original languageEnglish
Pages (from-to)201-207
Number of pages7
JournalJournal of Electroanalytical Chemistry
Issue number1-2
Publication statusPublished - 1994 Jul 8

ASJC Scopus subject areas

  • Analytical Chemistry
  • General Chemical Engineering
  • Electrochemistry


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