During the long-term operation of a La0.58Sr0.4Co0.2Fe0.8O3−δ (LSCF) membrane at 800 °C for nearly 3000 h, a stable permeation flux of (0.15 ± 0.01) ml cm−2 min−1 oxygen was achieved. Nevertheless degradation of the membrane surfaces due to kinetic demixing of mobile cations was observed. Different oxide layers were found on the feed and the permeate surfaces of the membrane.
Keywords: Kinetic demixing; Kinetic decomposition; Perovskite; Long-term operation; Permeation measurement; MIEC membrane; Degradation
Fig. 6. SEM picture of a cross fracture of the LSCF membrane after 3000 h of operation. (a) Sweep side. (b and c) Feed side.