Abstract
Ceramic materials with the perovskite structure are considered as new promising alternatives to Ni-based SOFC anodes. In this study La0.7Sr0.3VO3–δ-Ce0.85Sm0.15O2–δ (SDC) anode and La0.8Sr0.2CoO3-δ-SDC cathode were fabricated by infiltration of the porous SDC scaffold with an aqueous solution of corresponding nitrates. The time stability of SOFC single cell has been studied at fixed temperatures 600 and 700°C. As a fuel the mixture of humidified hydrogen (partial pressure of 0.2) and argon (partial pressure of 0.8) has been used. During 220 h operation (at 0.6 V) the decrease in maximum power density values at both temperatures was approximately 7%. The microstructure and composition of the single cells, mostly the mobility of Sr within the cell components, before and after time stability measurements, have been analyzed using secondary ion mass spectrometry. No degradation was observed during the cell preparation process and only minor elemental mobility was seen after 24 h of operation at 700°C. However, noticeable Sr mobility has been observed after 220 h operation at 700°C.
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