Reactivity of LSCF perovskites

摘要: Abstract The oxygen stoichiometry of La 1− x Sr Co y Fe O 3− δ perovskite powders LSCF 8228, 6428 and 2882 (numbers refer to stoichiometry) was investigated by means solid electrolyte coulometry (SEC) temperature-programmed reduction using carbon monoxide (CO-TPR). Experiments were performed at reduced partial pressures between 1.3×10 −3 6×10 −5 atm, applicable cathodic bias under oxide fuel cell operating conditions. It found that the degree nonstoichiometry ( ) increased with increasing temperature, decreasing pressure or content. CO-TPR studies indicate rate CO 2 production is dependent on heating β ), as well composition. In situ mass analysis during oxidation indicates samples low content (6428, 8228) show resistance deposition and/or carbonate formation.