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

^*この研究の対応する著者

研究成果: Article › 査読

16 被引用数 (Scopus)

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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.

本文言語	English
ページ（範囲）	941-945
ページ数	5
ジャーナル	Electrochimica Acta
巻	33
号	7
DOI	https://doi.org/10.1016/0013-4686(88)80092-6
出版ステータス	Published - 1988 1月 1
外部発表	はい

ASJC Scopus subject areas

化学工学（全般）
電気化学

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10.1016/0013-4686(88)80092-6

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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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In situ mossbauer effect spectroscopy of a model iron perovskite electrocatalyst

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