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Operando Analysis of NiFe and Fe Oxyhydroxide Electrocatalysts for Water Oxidation: Detection of Fe4+ by Mössbauer Spectroscopy

Chen, Jamie Y. C., Dang, Lianna, Liang, Hanfeng, Bi, Wenli, Gerken, James B., Jin, Song, Alp, E. Ercan, Stahl, Shannon S.·2015·Journal of the American Chemical Society

Abstract

Nickel-iron oxides/hydroxides are among the most active electrocatalysts for the oxygen evolution reaction. In an effort to gain insight into the role of Fe in these catalysts, we have performed operando Mössbauer spectroscopic studies of a 3:1 Ni:Fe layered hydroxide and a hydrous Fe oxide electrocatalyst. The catalysts were prepared by a hydrothermal precipitation method that enabled catalyst growth directly on carbon paper electrodes. Fe(4+) species were detected in the NiFe hydroxide catalyst during steady-state water oxidation, accounting for up to 21% of the total Fe. In contrast, no Fe(4+) was detected in the Fe oxide catalyst. The observed Fe(4+) species are not kinetically competent to serve as the active site in water oxidation; however, their presence has important implications for the role of Fe in NiFe oxide electrocatalysts.

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Metadata

Authors
Chen, J. Y. C., Dang, L., Liang, H., Bi, W., Gerken, J. B., Jin, S., Alp, E. E., & Stahl, S. S.
Venue
Journal of the American Chemical Society
Published
2015-11-25
Volume
137
Issue
48
Pages
15090-15093
ISSN
  • 0002-7863 (ISSN-L)
  • 1520-5126
OpenAlex
W2268456782
Cited by
872
References
4
FWCI
16.32
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Operando Analysis of NiFe and Fe Oxyhydroxide Electrocatalysts for Water Oxidation: Detection of Fe4+ by Mössbauer Spectroscopy. https://app.cochat.ai/papers/10.1021/jacs.5b10699
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Chen, J. Y. C., Dang, L., Liang, H., Bi, W., Gerken, J. B., Jin, S., Alp, E. E., & Stahl, S. S. (2015). Operando Analysis of NiFe and Fe Oxyhydroxide Electrocatalysts for Water Oxidation: Detection of Fe4+ by Mössbauer Spectroscopy. Journal of the American Chemical Society. https://doi.org/10.1021/jacs.5b10699

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