Power and Thermal Technologies for Air and Space. Delivery Order 0003: Development of High-Performance Solid Oxide Fuel Cell (SOFC) Technology for Remote Base Applications

摘要

The longevity performance of a tape cast SOFC using a LSM-based cathode was studied for 500 hours at various power densities. Polarization experiments indicated an enhancement in performance during the long-term polarization. Electrochemical Impedance Spectroscopy (EIS) experiments were used to deconvolute the component impedances in the cell. The EIS data indicated that the vast majority of cell activation was associated with a single semi-circular feature which occurred in the low frequency region. Additional experiments were performed to attempt to assign specific electrode processes to corresponding semicircular features in the EIS spectra. These data suggest that steady polarization of the cell results in a gradual increase in cell performance which can be attributed to a ripening of the LSM-based cathode.