Abstract
This paper aims to study the properties of the triple phase boundaries (TPBs) in the vicinity of the strontium-doped lanthanum manganite (cathode)/yttria-stabilized zirconia (electrolyte YSZ) interface in a solid oxide fuel cell (SOFC). The LaMnO3±δ (LM) nanometric films deposited on (100)YSZ can be considered as a realistic and simple model of this half-cell. Low pressure metal–organic chemical vapour deposition was used to elaborate these films and to control the La/Mn ratio in the range 0.8–1.3 by using La(tmhd)3 and Mn(acac)3 solid precursors at restricted temperature, pressure and time conditions. The film characteristics have been studied: morphology by SEM, chemical composition by energy-dispersive x-ray emission analysis and AES/scanning Auger microscopy and crystallography by x-ray diffraction and reflection high-energy electron diffraction. The half-cell performances at high temperature can be affected both by cation diffusion into YSZ and by the formation of foreign phases. Data are presented on the interfacial reactivity as analysed by the above techniques: important changes in the YSZ morphology in the TPB regions and the formation of epitaxial lanthanum zirconate are analysed for two La/Mn ratios (0.80 and 1.30). Copyright © 2000 John Wiley & Sons, Ltd.
Published Version
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