Abstract
Abstract The oxygen tracer diffusion and surface exchange coefficients of Sr 0.7 Ce 0.3 MnO 3-δ (SCM), measured by the 18 O/ 16 O isotopic exchange depth profile method with time-of-flight secondary-ion mass spectrometric analysis at 973–1123 K, are substantially higher than those of (La,Sr)MnO 3-δ . Testing of model solid oxide fuel cells (SOFCs) with SCM cathodes, ceria-based protective interlayers and Ni-containing cermet anodes demonstrated a relatively good and stable performance. For 0.5 mm thick solid electrolyte membranes made of ZrO 2 - 10 mol% Sc 2 O 3 - 1 mol% Y 2 O 3 and doped lanthanum gallate, the maximum power density at 1073 K was approximately 170 and 230 mW/cm 2 , respectively, without microstructural optimization and surface modification of the electrodes. Compared to another promising family of SOFC cathode materials, (La,Sr)(Co,Fe)O 3-δ , SCM exhibits significantly lower thermal and chemical expansion assessed by the controlled-atmosphere dilatometry.
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