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Effects of Fe-dopings through solid solution and grain-boundary segregation on the electrical properties of CeO2-based solid electrolyte

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Abstract

The 1 and 10 mol% Gd-doped ceria (1- and 10-GDC) solid solution powders were synthesized by co-precipitation method, then which were doped with 0.5 mol% Fe by the means of solid solution (SS) and preferred grain-boundary segregation (GBS), named as GDC-0.5Fe (SS) and (GBS), respectively. All the synthesized powders only show the CeO2 solid solution phase with grain sizes of 15.8~16.8 nm. Then, the corresponding GDC ceramics before and after Fe-doping were sintered at 800 °C for 1 h. The sole ceria solid solution phase appears in all the sintered samples with grain sizes of 59.8~112 nm. The Fe doping through solid solution always leads to the decrement in the electrical conductivity of both 1- and 10-GDC samples, while that through controlled grain-boundary segregation results in the increment of 10-GDC sample. The ion transference numbers of 1- and 10-GDC-0.5Fe (GBS) samples are all above 0.95 in 300~650 °C.

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Acknowledgments

We, all the authors, gratefully acknowledge the financial supports from the National Natural Science Foundation of China (No. 51102123 and No. 51462018), the National Undergraduate Training Programs for Innovation and Entrepreneurship (No. 201410674203), and the Academic Team Research Project on Membrane & Electrode Materials of Advanced Batteries in Kunming University of Science and Technology (No. 14078311).

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  1. Faculty of Materials Science & Engineering, Kunming University of Science & Technology, Kunming, Yunnan Province, 650093, People’s Republic of China

    B. Meng, Z. L. Lin, Y. J. Zhu, Q. Q. Yang, M. Kong & B. F. Meng

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  1. B. Meng
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  2. Z. L. Lin
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  3. Y. J. Zhu
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  4. Q. Q. Yang
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  5. M. Kong
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  6. B. F. Meng
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Correspondence to B. Meng.

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Meng, B., Lin, Z.L., Zhu, Y.J. et al. Effects of Fe-dopings through solid solution and grain-boundary segregation on the electrical properties of CeO2-based solid electrolyte. Ionics 21, 2575–2581 (2015). https://doi.org/10.1007/s11581-015-1422-2

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  • DOI: https://doi.org/10.1007/s11581-015-1422-2

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