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<p>Solid oxide fuel cell is a clean and efficient energy conversion device; the development of new electrolytes with high ionic conductivity is a critical challenge. It is considered that doped CeO<sub>2</sub>-based materials are the promising electrolytes for solid oxide fuel cells due to their superior properties. The structure and electrochemical performance of CeO<sub>2</sub> were optimized by partial Ce-substitution with trivalent Sm<sup>3+</sup> and Pr<sup>3+</sup> ions in this study. The crystal structure, electrochemical performance, and thermal expansion coefficient (TEC) of the synthesized Ce<sub>0.8</sub>Sm<sub>0.2-<i>x</i></sub>Pr<sub><i>x</i></sub>O<sub>1.9-<i>δ</i></sub> samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), and dilatometry. The results indicate that the addition of 5&#xa0;mol% of Pr can significantly improve the conductivity of Ce<sub>0.8</sub>Sm<sub>0.2</sub>O<sub>1.9</sub> and reduce the activation energy of oxygen ion migration and do not show the phase structure change. Based on the obtained experimental results, it can be determined that Ce<sub>0.8</sub>Sm<sub>0.2-<i>x</i></sub>Pr<sub><i>x</i></sub>O<sub>1.9-<i>δ</i></sub> can be further used as a solid electrolyte in solid oxide fuel cells (SOFCs).</p>

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Optimizing the structure and electrical properties of CeO2-based electrolyte via partial Ce-substitution with Sm and Pr

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • Lingling Xu,
  • Jihai Cheng,
  • Zhong Wu

摘要

Solid oxide fuel cell is a clean and efficient energy conversion device; the development of new electrolytes with high ionic conductivity is a critical challenge. It is considered that doped CeO2-based materials are the promising electrolytes for solid oxide fuel cells due to their superior properties. The structure and electrochemical performance of CeO2 were optimized by partial Ce-substitution with trivalent Sm3+ and Pr3+ ions in this study. The crystal structure, electrochemical performance, and thermal expansion coefficient (TEC) of the synthesized Ce0.8Sm0.2-xPrxO1.9-δ samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), and dilatometry. The results indicate that the addition of 5 mol% of Pr can significantly improve the conductivity of Ce0.8Sm0.2O1.9 and reduce the activation energy of oxygen ion migration and do not show the phase structure change. Based on the obtained experimental results, it can be determined that Ce0.8Sm0.2-xPrxO1.9-δ can be further used as a solid electrolyte in solid oxide fuel cells (SOFCs).