Oxygen reduction on adsorbed iron tetrapyridinoporphyrazine

A. A. Tanaka, C. Fierro, Daniel Alberto Scherson, E. Yeager

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

The electrocatalytic properties of iron tetrapyridino porphyrazine FeTPyPz for the reduction on O2 in alkaline media have been examined with cyclic voltammetry and rotating ring disk techniques. Four distinct redox peaks are observed in the absence of O2 in solution for this material adsorbed at monolayer coverages on ordinary pyrolytic graphite surfaces. The onset for O2 reduction appears to coincide with the voltammetric peak associated with the metal centered Fe(II)TPyPz/Fe(III)TPyPz transition. No hydrogen peroxide is detected at the ring in this potential range indicating that the reaction takes place by a four electron pathway. This is in contrast with the behavior observed at more negative potentials for which sizable currents for H2O2 oxidation are observed. This change in the mechanism has been attributed to the further reduction of the iron center in the macrocycle rendering an Fe(I)TPyPz species. If the electrode is polarized at potentials more negative than -0.8 V vs SCE, however, the reduction proceeds once again without generation of H2O2 in the solution phase. Quantum mechanical arguments involving orbital symmetry and overlap indicate that the activation could involve a simultaneous bonding of O2 to the iron center and a bridge nitrogen in the macrocycle ring. Such a potential dependent mechanism is similar to that reported earlier for iron tetrasulfonated phthalocyanine for which theoretically predicted electronic properties are essentially the same as those of FeTPyPz.

Original languageEnglish
Pages (from-to)431-456
Number of pages26
JournalMaterials Chemistry and Physics
Volume22
Issue number3-4
DOIs
Publication statusPublished - 1989 Jan 1
Externally publishedYes

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Iron
Oxygen
iron
oxygen
rings
Graphite
pyrolytic graphite
hydrogen peroxide
Hydrogen peroxide
Electronic properties
Hydrogen Peroxide
Cyclic voltammetry
Monolayers
Nitrogen
Metals
Chemical activation
activation
nitrogen
orbitals
Oxidation

ASJC Scopus subject areas

  • Materials Chemistry

Cite this

Oxygen reduction on adsorbed iron tetrapyridinoporphyrazine. / Tanaka, A. A.; Fierro, C.; Scherson, Daniel Alberto; Yeager, E.

In: Materials Chemistry and Physics, Vol. 22, No. 3-4, 01.01.1989, p. 431-456.

Research output: Contribution to journalArticle

Tanaka, AA, Fierro, C, Scherson, DA & Yeager, E 1989, 'Oxygen reduction on adsorbed iron tetrapyridinoporphyrazine', Materials Chemistry and Physics, vol. 22, no. 3-4, pp. 431-456. https://doi.org/10.1016/0254-0584(89)90009-6
Tanaka, A. A. ; Fierro, C. ; Scherson, Daniel Alberto ; Yeager, E. / Oxygen reduction on adsorbed iron tetrapyridinoporphyrazine. In: Materials Chemistry and Physics. 1989 ; Vol. 22, No. 3-4. pp. 431-456.
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