Effect of alumina additions in YSZ on the microstructure and degradation of the LSM–YSZ interface |
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Authors: | Ruth Knibbe John Drennan Jonathan G Love |
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Institution: | 1. Centre for Microscopy and Microanalysis, The University of Queensland, St. Lucia Queensland 4072, Australia;2. Ceramic Fuel Cells Limited, 170 Browns Road, Noble Park, Victoria 3174, Australia |
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Abstract: | The cathode–electrolyte interface in a solid oxide fuel cell is examined to understand why premature delamination is observed in alumina substituted YSZ electrolyte. From XRD, SEM and TEM observations it was concluded that after high temperature sintering a tetragonal (Mn,Al)3O4 forms at the interface, which during prolonged fuel cell operation forms a cubic (Mn,Al)3O4 phase. This transformation is associated with volume decrease creating voids which ultimately weaken the cathode–electrolyte interface sufficiently for the cathode layer to delaminate off the YSZ–Al2O3 electrolyte. |
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