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Improving the electrical properties of Er-doped CeO2: effect of sintering aids CaO, MgO, and TiO2 on conductivity

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Abstract

This research reports the synthesis, characterization, and electrical properties of the systems EryCe1−yO2−δ (y = 0.05, 0.1, and 0.15), and the effect of the incorporation of sintering aids (2 wt.% of CaO, MgO, and TiO2) on the electrical properties of the composition Er0.1Ce0.9O1.95, to be used as ceramic solid electrolytes in low-temperature solid oxide fuel cells (LT-SOFC). All EryCe1−yO2−δ samples were obtained by mechanochemistry (20 h of milling) and characterized by XRD. The morphology of the pure sintered compositions and with the incorporation of sintering aids (sintered at 1200 °C) was evaluated by FE-SEM. Electrical properties as a function of temperature (200–650 °C) and frequency (100 Hz–1 MHz) were evaluated by impedance spectroscopy. It reveals an increase of bulk ionic conductivity for higher contents of Er, as the number of oxygen vacancies increases. The higher value of conductivity (6.7 × 10–3 S cm−1) at 650 °C was for the composition Er0.15Ce0.85O1.925, while the ionic conductivity of Er0.1Ce0.9O1.95 at 650 °C increased from 2.68 × 10–3 S cm−1 to a maximum of 1.54 × 10–2 S cm−1 with the incorporation of CaO as additive. These improvements in bulk ionic conductivities can contribute to the development of more efficient electrolytes for the LT-SOFC technology.

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All data generated during this research are available from the corresponding author on reasonable request.

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Acknowledgements

This work was financially supported by Tecnológico Nacional de México (grants 14228.22-P and 17564). D. E. Puente-Martínez and K. A. Gonzalez-García thank Mexican CONACYT for the scholarship (557621 and 860984 respectively) granted for their Ph. D. studies. K. P. Padmasree thanks CONACYT Mexico for the grant A1-S-29845.

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Authors and Affiliations

  1. Tecnológico Nacional de México/I.T. Saltillo, 25280, Saltillo, Coahuila, Mexico

    D. E. Puente-Martínez, J. A. Díaz-Guillén, K. A. González-García & O. Burciaga-Díaz

  2. CIQA, Enrique Reyna Hermosillo 140, 25294, Saltillo, Coahuila, Mexico

    S. M. Montemayor

  3. COMIMSA-CONACYT, Ciencia y Tecnología 790, 25290, Saltillo, Coahuila, Mexico

    J. C. Díaz-Guillén

  4. Universidad Autónoma de Coahuila-UAdeC, Facultad de Ingeniería, 25354, Arteaga, Coahuila, Mexico

    M. E. Bazaldúa-Medellín

  5. CINVESTAV Unidad Saltillo, Av. Industria Metalúrgica 1062, 25900, Ramos Arizpe, Coahuila, Mexico

    K. P. Padmasree

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  1. D. E. Puente-Martínez
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Puente-Martínez, D.E., Díaz-Guillén, J.A., González-García, K.A. et al. Improving the electrical properties of Er-doped CeO2: effect of sintering aids CaO, MgO, and TiO2 on conductivity. J. Korean Ceram. Soc. 60, 817–829 (2023). https://doi.org/10.1007/s43207-023-00306-4

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