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Structural and electrical studies of Nd and Gd co-doped zirconia electrolytes for IT-SOFC applications

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Abstract

The Nd and Gd co-doped zirconia Zr1–x–yNdxGdyO2–δ (x, y = 0.025, 0.05, 0.075, and 0.10) system of materials were prepared through a modified sol–gel route. Sintering of the samples was conducted using conventional sintering at 1300 °C for 6 h. The prepared materials are characterized by powder X-ray diffraction (P–XRD), scanning electron microscopy with energy dispersive spectroscope (SEM with EDS), Fourier transform infrared (FTIR), Raman, and impedance spectroscopy. The dense electrolyte pellets are produced with co-doping in zirconia. P–XRD confirmed the formation of samples with single phases with stabilized cubic structure even after the sintering of co-doped zirconia samples. SEM and EDS revealed good density in surface microstructure and elemental confirmation in all the compositions. XRD and SEM studies also revealed the highest relative density and small grain size of Zr0.85Nd0.075Gd0.075O2–δ. FTIR disclosed the absorption bands corresponding to the chemical bonds of oxides in the compositions, and the findings are consistent with the P–XRD data. Raman spectroscopy analysis revealed the further phase confirmation of cubic structure. Impedance spectroscopy unveiled the enhanced electrical properties, i.e., enhanced ionic conductivity and small activation energy of NGZ7.5. The enhanced ionic conductivity, i.e., 0.47 × 10−2 S/cm at 550 °C with the stabilized cubic structure of Zr0.85Nd0.075Gd0.075O2–δ sample makes it suitable for solid electrolytes towards intermediate temperature solid oxide fuel cell applications.

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Acknowledgements

The author B Swamy thanks the CSIR, New Delhi, India, for financial assistance under the scheme of a CSIR-JRF (NET) fellowship during the research work.

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Authors and Affiliations

  1. Department of Physics, Osmania University, Hyderabad, 500007, Telangana, India

    B. Swamy, Chittimadula Madhuri & C. Vishnuvardhan Reddy

  2. Department of Physics (AS & H), Maturi Venkata Subba Rao (MVSR) Engineering College, Hyderabad, 501510, India

    Kasarapu Venkataramana

  3. Department of Humanities & Sciences (Physics), VNR Vignana Jyothi Institute of Engineering and Technology, Hyderabad, 500 090, India

    Ashok Bhogi

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  1. B. Swamy
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  2. Kasarapu Venkataramana
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Contributions

B Swamy: conceptualization, methodology, investigation, and writing—original draft. Kasarapu Venkataramana: investigation, software, analysis and interpretation of data, validation, draft writing, and correction. Chittimadula Madhuri: investigation, analysis and interpretation of data, data curation, and review and editing. Ashok Bhogi: correction and review and editing. C Vishnuvardhan Reddy: correction, writing—review and editing, and supervision.

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Correspondence to Kasarapu Venkataramana.

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Swamy, B., Venkataramana, K., Madhuri, C. et al. Structural and electrical studies of Nd and Gd co-doped zirconia electrolytes for IT-SOFC applications. Ionics 30, 2167–2176 (2024). https://doi.org/10.1007/s11581-024-05448-x

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