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High ionic conductivity dysprosium and tantalum Co-doped bismuth oxide electrolyte for low-temperature SOFCs

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Abstract

A novel double dysprosium- and tantalum-doped bismuth oxide electrolyte synthesized by solid-state reaction for low-temperature solid oxide fuel cells (LT-SOFCs) is here reported. The phase structures at room temperature were defined by X-ray powder diffraction (XRD). A stable δ-Bi2O3 phase was obtained by co-doping Bi2O3 with Dy2O3 and Ta2O5 in specific contents. The effect of the co-dopant total content (5–15 mol%) on the ionic conductivity was measured as a function of temperature (300 to 700 °C). Results revealed that the (Dy2O3)13(Ta2O5)2(Bi2O3)85 system showed the highest ionic conductivity as 0.08 S cm−1 at 500 °C, which is three times higher than the binary system reported in the literature (E2O3)20(Bi2O3)80 (20ESB) and in the same range as the ternary system with the highest conductivity reported so far (Dy2O3)8(W2O3)4(Bi2O3)88 (8D4WSB). The lowest activation energy for our system was 0.20 eV at temperatures higher than 550 °C.

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Acknowledgments

This investigation was carried out partially at CIMAV, CINVESTAV, CENAPROT, and LIDTRA laboratories. P.S. Cardenas-Terrazas thanks CONACYT for her scholarship (grant 449746). The authors also thank K. Campos-Venegas, E. Guerrero-Lestarjette, M. Roman-Aguirre, and A. M. Benitez Castro for the shared expertise and technical support.

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Authors and Affiliations

  1. Centro de Investigacion en Materiales Avanzados (CIMAV), Miguel de Cervantes 120, Complejo Industrial Chihuahua, C.P 31136, Chihuahua, Chih, Mexico

    P. S. Cardenas-Terrazas, D. A. Leal-Chavez, J. E. Ledezma-Sillas, C. Carreño-Gallardo & J. M. Herrera-Ramirez

  2. Centro de Investigacion y de Estudios Avanzados del Instituto Politecnico Nacional, Unidad Queretaro Libramiento Norponiente 2000, C.P. 76230, Santiago de Queretaro, Qro., Mexico

    M. T. Ayala-Ayala & J. Muñoz-Saldaña

  3. Centro de Investigacion y de Estudios Avanzados del Instituto Politecnico Nacional, Unidad Saltillo, Av. Industria Metalurgica 1062, Parque Industrial Saltillo Ramos Arizpe, C.P. 25900, Ramos Arizpe, Mexico

    A. F. Fuentes

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  1. P. S. Cardenas-Terrazas
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  2. M. T. Ayala-Ayala
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  3. J. Muñoz-Saldaña
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Correspondence to J. Muñoz-Saldaña or J. M. Herrera-Ramirez.

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Cardenas-Terrazas, P.S., Ayala-Ayala, M.T., Muñoz-Saldaña, J. et al. High ionic conductivity dysprosium and tantalum Co-doped bismuth oxide electrolyte for low-temperature SOFCs. Ionics 26, 4579–4586 (2020). https://doi.org/10.1007/s11581-020-03572-y

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  • DOI: https://doi.org/10.1007/s11581-020-03572-y

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