The stability of interfacial structure between air electrode and ceria‐based electrolyte (Sm2O3–CeO2, SDC) was evaluated under various polarization conditions at 1,000 °C. This is because the structural change at the interface is strongly related to the diffusion of constituent elements and has the potential to affect the long‐term stability. In this study, (La,Sr)MnO3 (LSM) and (La,Sr)(Co,Fe)O3 (LSCF) were applied as air electrodes. The cell with LSM/SDC interface showed the performance enhancement after cathodic polarization for 5 h, accompanied with the change in interfacial structure. The magnitude of the microstructural change as well as activation was dependent on the current density and the oxygen partial pressure. However, the active triple phase boundary (TPB)‐length decreased at every condition studied. On the other hand, no appreciable change in interfacial structure was confirmed for the LSCF/SDC system regardless of polarization conditions. In response to this phenomenon, the total TPB‐length was almost identical to the active one. The difference in morphological evolution at the interface depending on the electrode material was discussed.
The lateral mixing of solid particles in a centrifugal fluidized bed in which the rotation axis is horizontal was investigated from the unsteady-state behavior of tracer particles. The lateral mixing characteristics were analyzed by a diffusion model identical to that for a conventional fluidized bed. The lateral dispersion coefficient of particles was affected by variables such as gas velocity, rotational speed of the rotor, particle diameter, bed height and minimumfluidized velocity. From the experimental results an empirical equation for the coefficient was obtained. Its value for a centrifugal fluidized bed wassmaller than that calculated from empirical equations for a conventional fluidized bed, because of smaller bubble diameter and bed height, centrifugal force, and the like.
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