In situ Mössbauer study of redox processes in a composite hydroxide of iron and nickel

Dennis A. Corrigan, Robert S. Conell, Cristian A. Fierro, Daniel Alberto Scherson

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

In situ Mössbauer spectra revealed changes in the electronic and structural properties of Fe sites brought about by redox processes attributed formally to Ni sites in a composite iron/nickel hydroxide. Measurements on the oxidized form, polarized in 1 M KOH at 0.5 V vs. Hg/HgO, revealed a singlet with an isomer shift of 0.22 mm/s vs. α-Fe. After reduction and polarization at 0.0 V, a doublet with an isomer shift of 0.32 mm/s and a quadrupole splitting of 0.44 mm/s was observed. The spectral changes, which accompanied the formal oxidation of Ni sites at 0.5 V, indicated a partial transfer of electronic density away from trivalent Fe sites and structural rearrangements toward more symmetrical coordination about these sites. This highly oxidized iron species in the composite hydroxide may be involved in the electrocatalytic mechanism for oxygen evolution in alkaline media.

Original languageEnglish
Pages (from-to)5009-5011
Number of pages3
JournalJournal of physical chemistry
Volume91
Issue number19
Publication statusPublished - 1987 Dec 1
Externally publishedYes

Fingerprint

Nickel
Isomers
hydroxides
isomers
Iron
nickel
iron
composite materials
shift
Composite materials
electronics
Electronic properties
Structural properties
quadrupoles
Polarization
Oxygen
Oxidation
oxidation
oxygen
polarization

ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

Cite this

Corrigan, D. A., Conell, R. S., Fierro, C. A., & Scherson, D. A. (1987). In situ Mössbauer study of redox processes in a composite hydroxide of iron and nickel. Journal of physical chemistry, 91(19), 5009-5011.

In situ Mössbauer study of redox processes in a composite hydroxide of iron and nickel. / Corrigan, Dennis A.; Conell, Robert S.; Fierro, Cristian A.; Scherson, Daniel Alberto.

In: Journal of physical chemistry, Vol. 91, No. 19, 01.12.1987, p. 5009-5011.

Research output: Contribution to journalArticle

Corrigan, DA, Conell, RS, Fierro, CA & Scherson, DA 1987, 'In situ Mössbauer study of redox processes in a composite hydroxide of iron and nickel', Journal of physical chemistry, vol. 91, no. 19, pp. 5009-5011.
Corrigan DA, Conell RS, Fierro CA, Scherson DA. In situ Mössbauer study of redox processes in a composite hydroxide of iron and nickel. Journal of physical chemistry. 1987 Dec 1;91(19):5009-5011.
Corrigan, Dennis A. ; Conell, Robert S. ; Fierro, Cristian A. ; Scherson, Daniel Alberto. / In situ Mössbauer study of redox processes in a composite hydroxide of iron and nickel. In: Journal of physical chemistry. 1987 ; Vol. 91, No. 19. pp. 5009-5011.
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