Abstract
Layered perovskite oxide (GBCC) was investigated as a cathode material for intermediate-temperature solid oxide fuel cells (IT-SOFCs). The GBCC cathode was chemically compatible with the electrolytes (LSGM) and (SDC) at temperatures below . Compared with (LBCC) cathode, the electrical conductivity behaviors of GBCC and LBCC were quite distinct from each other in the studied temperature range due to the different electronic configurations of the rare-earth cations. The GBCC sample exhibited a semiconductor-like behavior. For the LBCC sample, however, there was a transition of the electrical conductivity behavior from semiconductor-like to metal-like for temperatures higher than . The thermal expansion coefficient of samples significantly decreased from for LBCC to for GBCC in the temperature range of , although the area specific resistance (ASR) increased. The ASRs of the GBCC cathode on the LSGM and SDC electrolytes were 0.091 and at , respectively. At , the power densities of a single cell were 545 and for the LSGM and SDC electrolytes, respectively, making it a promising candidate as a cathode material for IT-SOFCs.
Published Version
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