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Effect of barium on LSGM electrolyte prepared by fast combustion method for solid oxide fuel cells (SOFC)

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Abstract

In this work, La0.85Sr0.15–xBaxGa0.85Mg0.15O3–δ (LSBGM), with 0 ≤ x ≤ 0.075, were prepared as electrolytes for solid oxide fuel cells applications. The effect of barium and sintering temperature on the structure and electrical properties was studied. A fast combustion method was used, starting with nitrate salts and citric acid as fuel. The XRD spectra showed two main phases corresponding to LSGM orthorhombic (space group Imma) and LSGM-cubic (space group Pm-3 m). From literature, both structures are reported as high oxygen ion conductive species, but normally, they are not reported to appear together. Major secondary phases were LaSrGaO4, BaLaGaO4, and BaLaGaO7. SEM revealed a material with low porosity, indicating incomplete densification. The sample La0.85Sr0.075Ba0.075Ga0.85Mg0.15O3–δ showed a conductivity of 0.016 and 0.058 S cm−1 at 600 °C and 800 °C, respectively. This means an improvement of 34% compared to the non-barium sample La0.85Sr0.15Ga0.85Mg0.15O3-δ at 600 °C. Thus, this composition could be used in SOFC.

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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgments

The authors acknowledge the financial support of FONDECYT (ANID) Project No.:1181703. Government of Chile. The authors thank Mónica Uribe from Instituto de Geología Aplicada. UDEC; the Centro de Microscopía Avanzada. CMA BIO-BIO. Proyecto PIA-ANID ECM-12 for their contribution to this work.

Funding

This work was funded by the National Agency for Research and Development (ANID) / Scholarship Program/DOCTORADO NACIONAL/21202168.

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Authors and Affiliations

  1. Advanced Ceramics and Nanotechnology Laboratory, Department of Materials Engineering, Faculty of Engineering, University of Concepcion, 4070409, Concepción, Chile

    Erwin Sepúlveda, Ramalinga Viswanathan Mangalaraja & Felipe Sanhueza

  2. Faculty of Engineering and Sciences, Universidad Adolfo Ibáñez, Diagonal Las Torres 2640, Santiago, Peñalolén, Chile

    Ramalinga Viswanathan Mangalaraja

  3. Institute of Materials and Thermomechanics, Universidad Austral de Chile, General Lagos 2086, 5111187, Valdivia, Chile

    Loreto Troncoso

  4. Materalia Group—Physical Metallurgy Department, National Centre for Metallurgical Research (CENIM-CSIC), Av. de Gregorio del Amo, 8, 28040, Madrid, Spain

    José Jiménez

  5. Departamento de Ingeniería Mecánica, Facultad de Ingeniería, Universidad del Bío-Bío, 4030000, Concepción, Chile

    Christopher Salvo

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  1. Erwin Sepúlveda
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Correspondence to Erwin Sepúlveda or Ramalinga Viswanathan Mangalaraja.

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Sepúlveda, E., Mangalaraja, R.V., Troncoso, L. et al. Effect of barium on LSGM electrolyte prepared by fast combustion method for solid oxide fuel cells (SOFC). MRS Advances 7, 1167–1174 (2022). https://doi.org/10.1557/s43580-022-00373-5

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