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  Influence of the cobalt content in cobalt iron oxides on the electrocatalytic OER activity

Saddeler, S., Bendt, G., Salamon, S., Haase, F., Landers, J., Timoshenko, J., et al. (2021). Influence of the cobalt content in cobalt iron oxides on the electrocatalytic OER activity. Journal of Materials Chemistry A, 9(45), 25381-25390. doi:10.1039/D1TA06568H.

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Influence of the cobalt content in cobalt iron oxides on the electrocatalytic OER activity - d1ta06568h.pdf (Publisher version), 26MB
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Influence of the cobalt content in cobalt iron oxides on the electrocatalytic OER activity - d1ta06568h.pdf
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 Creators:
Saddeler, Sascha1, Author
Bendt, Georg1, Author
Salamon, Soma2, Author
Haase, Felix3, Author              
Landers , Joachim2, Author
Timoshenko, Janis3, Author              
Rettenmaier, Clara3, Author              
Jeon, Hyosang3, Author              
Bergmann, Arno3, Author              
Wende, Heiko2, Author
Roldan Cuenya, Beatriz3, Author              
Schulz, Stephan1, Author
Affiliations:
1Institute for Inorganic Chemistry, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstr. 5-7, D-45117 Essen, Germany , ou_persistent22              
2Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Lotharstr. 1, D-47057 Duisburg, Germany , ou_persistent22              
3Interface Science, Fritz Haber Institute, Max Planck Society, ou_2461712              

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 Abstract: Sub 10 nm cobalt ferrite CoxFe3−xO4 (x ≤ 1.75) nanoparticles and cobalt-rich wüstite (Cox/3Fe(1−x)/3)O nanoparticles (x ≥ 2) were synthesized in a solvothermal approach and characterized by powder X-ray diffraction (PXRD), selected area electron diffraction (SAED), transmission electron microscopy (TEM) as well as energy dispersive X-ray spectroscopy (EDX), IR, Raman, and 57Fe-Mössbauer spectroscopy. Their electrocatalytic activity in the oxygen evolution reaction (OER) was evaluated and the active state formation was tracked by operando X-ray absorption spectroscopy (XAS). Our studies demonstrate that the cobalt-rich wüstite (Cox/3Fe(1−x)/3)O nanoparticles underwent a phase-transformation into the spinels CoxFe3−xO4 (x ≥ 2) under the applied OER conditions. The overpotential η10 at 10 mA cm−2, serving as a benchmark for the OER activity of the cobalt ferrite nanoparticles in alkaline media, was lower than that of magnetite Fe3O4 even with low cobalt concentrations, reaching a minimum of 350 mV for Co2.25Fe0.75O4 with a Tafel slope of 50 mV dec−1. Finally, we identified that the catalytic activity is linked to the nanoparticle size as well as to the degree of Co redox activity and change in coordination during OER.

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Language(s): eng - English
 Dates: 2021-08-032021-10-152021-10-152021-12-07
 Publication Status: Published in print
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1039/D1TA06568H
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Title: Journal of Materials Chemistry A
  Abbreviation : J. Mater. Chem. A
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: 10 Volume / Issue: 9 (45) Sequence Number: - Start / End Page: 25381 - 25390 Identifier: ISSN: 2050-7488
CoNE: https://pure.mpg.de/cone/journals/resource/2050-7488