Abstract
Solid oxide fuel cells cathode often suffers from degradation caused by water vapor in air. Here, we report a cathode material, La0.4Sr0.6Co0.2Fe0.7Nb0.1O3−δ (LSCFN), and evaluate its humidity tolerance by the characterization of the materials in wet air with different water vapor concentration at different temperature. The X-ray diffraction analysis indicates that the crystal structure of LSCFN is relatively stable in wet air with no observable impurity. However, a crystalline contraction is observed. Exposure of wet air to LSCFN causes the decrease of electrical conductivity and increase of polarization resistance because H2O might occupy the active sites for oxygen reduction reaction. For long-term operation, higher H2O concentration in air accelerates the degradation of LSCFN cathode.
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