In situ mossbauer effect spectroscopy of a model iron perovskite electrocatalyst

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

doi:10.1016/0013-4686(88)80092-6

In situ mossbauer effect spectroscopy of a model iron perovskite electrocatalyst

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

The electrochemical properties of SrFeO_2.91 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 language	English
Pages (from-to)	941-945
Number of pages	5
Journal	Electrochimica Acta
Volume	33
Issue number	7
DOIs	https://doi.org/10.1016/0013-4686(88)80092-6
Publication status	Published - 1988 Jan 1
Externally published	Yes

ASJC Scopus subject areas

Chemical Engineering(all)
Electrochemistry

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title = "In situ mossbauer effect spectroscopy of a model iron perovskite electrocatalyst",

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.",

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T1 - In situ mossbauer effect spectroscopy of a model iron perovskite electrocatalyst

AU - Fierro, C.

AU - Carbonio, R. E.

AU - Scherson, Daniel Alberto

AU - Yeager, E. B.

PY - 1988/1/1

Y1 - 1988/1/1

N2 - 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.

AB - 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.

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JO - Electrochimica Acta

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In situ mossbauer effect spectroscopy of a model iron perovskite electrocatalyst

Abstract

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