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In situ X-ray studies of film cathodes for solid oxide fuel cells

Fuoss, Paul ; Chang, Kee-Chul ; You, Hoydoo

Journal of Electron Spectroscopy and related Phenomena, 2013-10, Vol.190 (Oct. 2013), p.75-83 [Periódico revisado por pares]

United States: Elsevier B.V

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  • Título:
    In situ X-ray studies of film cathodes for solid oxide fuel cells
  • Autor: Fuoss, Paul ; Chang, Kee-Chul ; You, Hoydoo
  • Assuntos: Backbone ; Cathode ; Cathodes ; Coarsening ; CTR ; Electrolytic cells ; Infiltration ; Segregations ; Solid oxide fuel cell (SOFC) ; Solid oxide fuel cells ; TXRF ; USAX ; X-ray reflectivity ; X-rays
  • É parte de: Journal of Electron Spectroscopy and related Phenomena, 2013-10, Vol.190 (Oct. 2013), p.75-83
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
    SC OFFICE OF FOSSIL ENERGY
    DE-AC02-06CH11357
    ANL/MSD/JA-75965
  • Descrição: •Synchrotron X-rays are used to study in operando the structural and chemical changes of LSM and LSCF film cathodes during half-cell operations.•A-site and B-site cations actively segregate or desegregate on the changes of temperature, pO2, and electrochemical potential.•Chemical lattice expansions show that oxygen-cathode interface is the primary source of rate-limiting processes.•The surface and subsurface of the LSM and LSCF films have different oxidation-states due to vacancy concentration changes.•Liquid-phase infiltration and coarsening processes of cathode materials into porous YSZ electrolyte backbone were monitored by USAXS. Synchrotron-based X-ray techniques have been used to study in situ the structural and chemical changes of film cathodes during half-cell operations. The X-ray techniques used include X-ray reflectivity (XR), total-reflection X-ray fluorescence (TXRF), high-resolution diffraction (HRD), ultra-small angle X-ray scattering (USAXS). The epitaxial thin film model cathodes for XR, TXRF, and HRD measurements are made by pulse laser deposition and porous film cathodes for USAX measurements are made by screen printing technique. The experimental results reviewed here include A-site and B-site segregations, lattice expansion, oxidation-state changes during cell operations and liquid-phase infiltration and coarsening of cathode to electrolyte backbone.
  • Editor: United States: Elsevier B.V
  • Idioma: Inglês;Francês;Alemão
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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