La0.84Sr0.16MnO3-[delta] cathodes impregnated with Bi1.4Er0.6O3 for intermediate-temperature solid oxide fuel cells

Abstract

La0.84Sr0.16MnO3-delta-Bi1.4Er0.6O3 (LSM-ESB) composite cathodes are fabricated by impregnating LSM electronic conducting matrix with the ion-conducting ESB for intermediate-temperature solid oxide fuel cells (IT-SOFCs). The performance of LSM-ESB cathodes is investigated at temperatures below 750C by AC impedance spectroscopy. The ion-impregnation of ESB significantly enhances the electrocatalytic activity of the LSM electrodes for the oxygen reduction reactions, and the ion-impregnated LSM-ESB composite cathodes show excellent performance. At 750C, the value of the cathode polarization resistance (Rp) is only 0.11Omegacm2 for an ion-impregnated LSM-ESB cathode, which also shows high stability during a period of 200h. For the performance testing of single cells, the maximum power density is 0.74Wcm-2 at 700C for a cell with the LSM-ESB cathode. The results demonstrate the ion-impregnated LSM-ESB is one of the promising cathode materials for intermediate-temperature solid oxide fuel cells.

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