Question

Samarium-doped ceria (SmxCe1-xO2-δ, SDC) an intermediate-temperature oxygen ion conductor, which has also been extensively used for solid oxide fuel cells. However, this compound showed a low open circuit voltage because of the existence of electronic conductivity at a significantly low oxygen partial pressure. Please write down defect reaction to explain why SDC can be used as oxygen ion conductor. Please also write down defect reaction to explain why SDC showed high electronic conductivity at low oxygen partial pressure

Answer 1

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