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Deciphering the Ce3+ to Ce4+ Evolution: Insight from X-ray Raman Scattering Spectroscopy at Ce N4,5 Edges.

Soumya K Das1,2, Alessandro Longo1,3, Eugenio Bianchi1,4

  • 1European Synchrotron Radiation Facility, 71, Avenue des Martyrs, Grenoble, F-38000, France.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|October 31, 2024
PubMed
Summary
This summary is machine-generated.

X-ray Raman Scattering (XRS) quantifies cerium oxidation states (Ce3+/Ce4+) in cerium oxide (CeO2) bulk. This method works under realistic conditions, aiding catalysis and energy research.

Keywords:
Ce N45 edgesHilbert++OxidationX-ray Raman Scattering SpectroscopyXRD

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Area of Science:

  • Materials Science
  • Catalysis
  • Spectroscopy

Background:

  • Cerium oxide (ceria, CeO2) is vital for catalysis and energy, owing to its oxygen storage capacity.
  • This capacity relies on the reversible switch between Ce4+ and Ce3+ oxidation states, creating oxygen vacancies.
  • Accurate in-situ quantification of these oxidation states is essential for understanding reaction mechanisms.

Purpose of the Study:

  • To evaluate X-ray Raman Scattering (XRS) spectroscopy as a method for quantifying Ce3+ and Ce4+ oxidation states in ceria.
  • To demonstrate XRS's capability for in-situ bulk analysis under realistic environmental conditions.
  • To compare XRS results with in-situ X-ray Diffraction (XRD) and discuss probe differences.

Main Methods:

  • In-situ X-ray Raman Scattering (XRS) spectroscopy was employed to probe cerium oxidation states.
  • The Hilbert++ code was utilized for simulating XRS spectra and quantifying Ce3+/Ce4+ content.
  • Parallel in-situ X-ray Diffraction (XRD) measurements were performed for comparative analysis.

Main Results:

  • XRS successfully observed oxidation state changes of cerium directly within the material's bulk.
  • Simulations using Hilbert++ provided accurate quantification of Ce3+ and Ce4+ concentrations.
  • Comparison with XRD revealed differences attributable to the distinct probing mechanisms of XRS and XRD.

Conclusions:

  • X-ray Raman Scattering is a viable and powerful technique for in-situ cerium oxidation state determination in ceria.
  • The method's ability to analyze bulk material under realistic conditions offers significant advantages for catalysis research.
  • Understanding the interplay between XRS and XRD provides deeper insights into ceria's behavior in energy applications.