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Characteristic features of SOFC stacks are summarized in their relations to fabrication sequences adopted for respective stack designs. Important correlation has been obtained between degraded parts and their sintering temperatures; a lower sintering temperature gives rise to more vulnerability against microstructure changes or impurities. Detailed analyses have been given for deterioration of electrolytes with an emphasis on the transition metal precipitation depending on the oxygen partial pressure distribution developed inside the electrolyte. Particularly, manganese oxide precipitation causing disintegration is discussed for LSM cathode‐YSZ electrolyte system, whereas the electrical conductivity lowering due to phase transformation from the cubic to the tetragonal phase is described for the NiO‐dissolved YSZ system. Poisoning effects for cathodes are compared between Lanthanum strontium manganite (LSM) and Lanthanum strontium ferrite cobaltite (LSCF) cathodes. For anodes, effects of sulfur and phosphor are described with an emphasis on nickel sintering and its enhancement by impurities.

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