abstract
The oxygen tracer diffusion and surface exchange coefficients of Sr0.7Ce0.3MnO3-delta (SCM), measured by the O-18/O-16 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)MnO3-delta. 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 ZrO2- 10 mol% Sc2O3- 1 mol% Y2O3 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)O3-delta, SCM exhibits significantly lower thermal and chemical expansion assessed by the controlled-atmosphere dilatometry. (C) 2013 Elsevier B.V. All rights reserved.
keywords
ELECTRICAL-PROPERTIES; FUEL-CELLS; CONDUCTIVITY; PERMEABILITY; ELECTROLYTE; LA(SR)MNO3; STABILITY; OXIDE
subject category
Chemistry; Physics
authors
Kuritsyna, I; Sinitsyn, V; Melnikov, A; Fedotov, Y; Tsipis, E; Viskup, A; Bredikhin, S; Kharton, V
our authors
Ekaterina Tsipis
Post-doc Fellowship
Vladislav Kharton
Invited Principal ResearcherGroups