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Título

Visualization by neutron diffraction of 2D oxygen diffusion in the Sr 0.7Ho0.3CoO3-δ cathode for solid-oxide fuel cells

AutorCascos, Vanessa CSIC ORCID; Martínez-Coronado, R. CSIC; Alonso, J. A. CSIC ORCID; Fernández-Díaz, M. T.
Palabras claveIT-SOFC
Neutron diffraction
Sr0.7Y0.3CoO3−δ
SrCoO3−δ
Cathode
Fecha de publicación25-jun-2014
EditorAmerican Chemical Society
CitaciónACS Applied Materials and Interfaces 6(12): 9194-9200 (2014)
ResumenSr0.7Ho0.3CoO3-δ oxide has been recently described as an excellent cathode material (1274 mW cm-2 at 850°C with pure H2 as fuel1) for solid oxide fuel cells (SOFCs) with LSGM as electrolyte. In this work, we describe a detailed study of its crystal structure conducted to find out the correlation between the excellent performance as a cathode and the structural features. The tetragonal crystal structure (e.g., I4/mmm) basically contains layers of octahedrally coordinated Co2O6 units alternated with layers of Co1O4 tetrahedra sharing corners. An >in situ> neutron power diffraction (NPD) experiment, between 25 and 800°C, reveals the presence of a high oxygen deficiency affecting O4 oxygen atoms, with large displacement factors that suggest a large lability and mobility. Difference Fourier maps allow the visualization at high temperatures of the 2D diffusion pathways within the tetrahedral layers, where O3 and O4 oxygens participate. The measured thermal expansion coefficient is 16.61 × 10-6 K-1 between 300 and 850°C, exhibiting an excellent chemical compatibility with the electrolyte.
Versión del editorhttp://doi.org/10.1021/am501297z
URIhttp://hdl.handle.net/10261/182079
DOI10.1021/am501297z
Identificadoresdoi: 10.1021/am501297z
e-issn: 1944-8252
1944-8244
Aparece en las colecciones: (ICMM) Artículos




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