Electrochemical catalytic reduction of molecular oxygen by iron porphyrin ion-complex modified electrode

Takahiro Sawaguchi, Tomokazu Matsue, Kingo Itaya, Isamu Uchida

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)


The iron porphyrin ion-complex, which is electrostatic aggregate of iron meso-tetrakis- (N-methyl-4-pyridyl)porphyrin (FeTMPyP, cationic) and iron meso-tetrakis(p-sulfophenyl)porphyrin (FeTPPS, anionic), has a catalytic activity for the reduction of molecular oxygen in aqueous solutions. Rotating ring-disk voltammetric measurements show the two different reaction pathways for the oxygen reduction; one is in a lower and other in a higher overpotential region. The main product in lower overpotentials is hydrogen peroxide but 12% of molecular oxygen is reduced to water directly via four-electron process. In higher overpotentials, the iron porphyrin ion-complex also acts as a catalyst for the reduction of hydrogen peroxide. The four-electron process and the two step pathway through intermediate hydrogen peroxide occur. From these results, it can be presumed that some of iron porphyrin aggregates form a "face-to-face"-like structure by the electrostatic interaction and provide the effective sites for the reduction of molecular oxygen.

Original languageEnglish
Pages (from-to)703-708
Number of pages6
JournalElectrochimica Acta
Issue number3-4
Publication statusPublished - 1991


  • ion-complex
  • iron porphyrin
  • modified electrode
  • oxygen reduction


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