Publication date: 10th April 2024
Ceria and its solid solutions exhibit excellent redox properties and stability in a wide range of temperatures and oxygen partial pressures (pO2). These materials therefore find applications in solid oxide cells (SOCs), oxygen separation membranes, catalytic surface coatings, and oxygen sensors. In the present study, we have investigated the electrical conductivity of Gd0.10Ce0.90O2-δ (GCO) as a function of both pO2 (10-0.36-10-25 bar) and temperature (650-850 ͦC). Experimental data are modeled in terms of the underlying defect chemistry. Our work clearly highlights departures from ideal solution behavior by concurrently modeling data of oxygen non-stoichiometry and electrical conductivity. Our analysis starts with analyzing literature data on the oxygen non-stoichiometry of GCO.1 Following Mizusaki et al.2,3, and in agreement with earlier reports for doped ceria,4,5 we demonstrate that the observed decrease in reduction enthalpy for GCO with decreasing pO2 can be accounted for by the interactions between the involved ionic and electronic defects. The non-ideality of the experimental data of electrical conductivity can also be traced back to the interactions of defects. The results indicate that upon reduction the small polarons formed in GCO retain their mobile character, rather than being trapped in complex defect associates as has been suggested previously.1
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