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The electrical conductivity of Dy3+/Sc3+ co-doped CeO2 solid electrolytes

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Abstract

The Dy3+ single doped and Dy3+/Sc3+ co-doped CeO2 electrolyte powders were successfully synthesized by a sol–gel method followed by calcination at 800 °C for 3 h. The powdered samples were isostatically dry-pressed at 200 MPa and sintered at 1450 °C for 5 h to form into cylindrical electrolyte discs for testing. A total of four samples were prepared in this study, namely Ce0.75ScxDy0.25−xOδ where x = 0, 0.03, 0.04, and 0.05 mol. This work investigated the factors of influencing the electrical conductivity of Dy3+/Sc3+ co-doped electrolyte, relative to the Dy3+ single doped CeO2. The phase, surface morphology, and oxygen vacancy were characterized by x-ray diffraction (XRD), scanning electron microscope (SEM), and Raman spectrometer, respectively. The results of this study showed that the doped CeO2 samples retain a singular cubic fluorite structure of CeO2, but with further contracted unit cell dimensions relative to the Dy3+ single doped CeO2. The co-doping of Sc3+ was found to reduce the grain size, increase the oxygen vacancy concentration, and enhance the conductivity of the co-doped CeO2 samples than the Dy3+ single doped sample. The highest electrical conductivity of 2.32 × 10−2 S cm−1 at 600 °C was achieved at the Sc3+ doping level of x = 0.04 mol among all co-doped samples, corresponding to the highest oxygen vacancy concentration found in these samples.

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Acknowledgment

This work is financially supported by the National Natural Science Foundation of China under grant no. 51474133.

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Authors and Affiliations

  1. School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou, 014010, Inner Mongolia, China

    You Xue, Shengli An, Shuting Li, Jun Peng, Changkun Cai & Yuanyuan Liu

  2. Inner Mongolia Key Laboratory of Advanced Ceramic Materials and Devices, Baotou, 014010, Inner Mongolia, China

    You Xue, Shengli An, Shuting Li, Jun Peng, Changkun Cai & Yuanyuan Liu

  3. College of Chemistry and Chemical Engineering, Inner Mongolia University of Science and Technology, Baotou, 014010, Inner Mongolia, China

    Yuanyuan Liu

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  1. You Xue
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Xue, Y., An, S., Li, S. et al. The electrical conductivity of Dy3+/Sc3+ co-doped CeO2 solid electrolytes. J Solid State Electrochem 24, 1639–1646 (2020). https://doi.org/10.1007/s10008-020-04705-z

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  • DOI: https://doi.org/10.1007/s10008-020-04705-z

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