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Anisotropic 18O tracer diffusion in epitaxial films of GdBaCo2O5+δ cathode material with different orientations

AutorZapata, James ; Burriel, Mónica; García, Pablo; Kilner, John A.; Santiso, José
Fecha de publicación2013
EditorRoyal Society of Chemistry (Great Britain)
CitaciónJournal of Materials Chemistry A 1(25): 7408-7414 (2013)
ResumenThe layered structure of the orthorhombic GdBaCo2O 5+δ (GBCO) double perovskite compound, currently considered as a promising cathode material in Solid Oxide Fuel Cells (SOFCs), is believed to induce a high degree of anisotropy in the oxygen diffusion coefficient, being maximum along the a-b plane in comparison to the diffusion along the c-axis direction. In this study we have deposited films with different orientation: pure c-axis and a-axis orientation on SrTiO3(001) and NdGaO 3(110) single crystals, respectively. The oxygen diffusion was analysed by isotopic 18O exchange depth profiling (IEDP) and Time-of-flight Secondary Ion Mass Spectrometry (ToF-SIMS) in the films along the longitudinal and transverse directions at different exchange temperatures and exposure times. The magnitude of longitudinal D* at low temperatures shows a clear anisotropy. The oxygen diffusion along the a-axis shows comparable values to the bulk polycrystalline GBCO, while it is about one order of magnitude lower along the c-axis of the structure. The corresponding oxygen surface exchange rates k* do not show any anisotropy having comparable values for c-axis and a-axis orientation. These k* values are slightly larger than those reported for bulk material showing that thin film textured cathodes may have enhanced activity for oxygen reduction at low temperatures. This journal is © The Royal Society of Chemistry 2013.
Versión del editorhttp://dx.doi.org/10.1039/c3ta10749c
Identificadoresdoi: 10.1039/c3ta10749c
issn: 2050-7488
e-issn: 2050-7496
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