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  Unraveling the Evolution of Dynamic Active Sites of LaNixFe1–xO3 Catalysts During OER

Cheraparambil, H., Vega-Paredes, M., Scheu, C., & Weidenthaler, C. (2024). Unraveling the Evolution of Dynamic Active Sites of LaNixFe1–xO3 Catalysts During OER. ACS Applied Materials and Interfaces, 16(17), 21997-22006. doi:10.1021/acsami.4c02502.

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 Creators:
Cheraparambil, Haritha1, Author           
Vega-Paredes, Miquel2, Author
Scheu, Christina2, Author
Weidenthaler, Claudia1, Author           
Affiliations:
1Research Group Weidenthaler, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1950291              
2Max-Planck-Institut für Eisenforschung, Max-Planck-Straße 1, Düsseldorf 40237, Germany, ou_persistent22              

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Free keywords: perovskites; oxygen evolution reaction; active sites; surface-enhanced raman spectroscopy; electron energy loss spectroscopy
 Abstract: Perovskites have attracted tremendous attention as potential catalysts for the oxygen evolution reaction (OER). It is well-known that the introduction of Fe into rare earth perovskites such as LaNiO3 enhances the intrinsic OER activity. Despite numerous studies on structure–property relationships, the origin of the activity and the nature of the active species are still elusive and unclear. In this work, we study a series of LaNixFe1–xO3 perovskites using in situ electrochemical surface-enhanced Raman spectroscopy and electron energy loss spectroscopy to decipher the surface evolution and formation of active species during OER. While the origin of the activity arises from NiOOH species formed from the active Ni centers in LaNiO3, our work shows that Fe serves as the active center in LaNi0.5Fe0.5O3 and forms Fe–O–Ni and FeOOH species during OER. The OER activity of LaFeO3 originates from FeOOH species, which interact with the soluble Ni species in the electrolyte forming an active electrode–electrolyte interface with high-valent stable surface iron species (Fe4+) and thereby improving the performance. Our work provides deeper insights into the synergistic effects of Ni and Fe on the catalytic activity, which in turn provides new design principles for perovskite catalysts for the OER.

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Language(s): eng - English
 Dates: 2024-02-132024-04-222024-05-01
 Publication Status: Issued
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acsami.4c02502
 Degree: -

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Title: ACS Applied Materials and Interfaces
  Abbreviation : ACS Appl. Mater. Interfaces
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 16 (17) Sequence Number: - Start / End Page: 21997 - 22006 Identifier: ISSN: 1944-8244
CoNE: https://pure.mpg.de/cone/journals/resource/1944-8244