Abstract
AbstractThe main purpose of this work is to verify the influence of the addition of lithium on the densification and electrical conductivity of a gadolinium‐doped ceria electrolyte. The lithium dopant was added directly during the sol–gel synthesis without a grinding step or the use of a dispersant solution. Electrolytes were prepared from powders and sintered at 1250 and 1500 °C. The characterization techniques used were XRD, FTIR spectroscopy, SEM, BET analysis, and electrochemical impedance spectroscopy for ionic conductivity. The densification achieved was >97 and >99 % of the theoretical density at sintering temperatures of 1250 and 1500 °C, respectively, by adding 2 mol % of lithium. The densification of gadolinium‐doped ceria is caused by lithium deposition in the grain boundaries, which reduces structural imperfections. The ionic conductivity of lithium‐doped pellets sintered at 1250 °C is the same as that of pure ones sintered at 1500 °C with a maximum value of 5.2×10−2 S cm−1 at 800 °C. Lithium addition is an effective strategy to reduce the sintering temperature and retain high conductivity values.
Published Version
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