In situ mossbauer effect spectroscopy of a model iron perovskite electrocatalyst

C. Fierro, R. E. Carbonio, Daniel Alberto Scherson, E. B. Yeager

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The electrochemical properties of SrFeO2.91 dispersed on a high area carbon in alkaline media have been investigated by cyclic voltammetry and in situ Mosbauer spectroscopy. The results provide evidence that a fraction of Fe(IV) sites, as monitored in situ, undergo a gradual and irreversible decrease upon exposure of the material to an alkaline solution. This has been attributed to the reduction of such oxidized sites by water, generating most likely an hydroxylated ferric species. In addition it was found that the voltammetry peak observed during the first scan in the negative direction is associated with the irreversible destruction of the perovskite lattice. The only iron species formed and detected by Mossbauer spectroscopy is Fe(OH)2 which then urdergoes reoxidation at much more positive potentials to yield a hydrated ferric oxyhydroxide.

Original languageEnglish
Pages (from-to)941-945
Number of pages5
JournalElectrochimica Acta
Volume33
Issue number7
DOIs
Publication statusPublished - 1988 Jan 1
Externally publishedYes

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Electrocatalysts
Mossbauer spectroscopy
Voltammetry
Electrochemical properties
Perovskite
Cyclic voltammetry
Carbon
Iron
Spectroscopy
Water
Direction compound
perovskite
ferrihydrite

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

Cite this

In situ mossbauer effect spectroscopy of a model iron perovskite electrocatalyst. / Fierro, C.; Carbonio, R. E.; Scherson, Daniel Alberto; Yeager, E. B.

In: Electrochimica Acta, Vol. 33, No. 7, 01.01.1988, p. 941-945.

Research output: Contribution to journalArticle

Fierro, C. ; Carbonio, R. E. ; Scherson, Daniel Alberto ; Yeager, E. B. / In situ mossbauer effect spectroscopy of a model iron perovskite electrocatalyst. In: Electrochimica Acta. 1988 ; Vol. 33, No. 7. pp. 941-945.
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