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<p>Doped ceria electrolytes are extensively studied and applied in intermediate-low temperature solid oxide fuel cell (IT-SOFC). Ce<sub>0.79</sub>Gd<sub>0.2-x</sub>Ca<sub>x</sub>Cu<sub>0.01</sub>O<sub>2-δ</sub> electrolytes were synthesized by the ultrasonic-assisted sol-gel self combustion sintering method. The experimental results demonstrate that incorporating 1.0&#xa0;mol% Cu into gadolinium-doped ceria (GDC) enables a reduction in sintering temperature by 500&#xa0;°C, while Ca co-doping effectively increases oxygen vacancy formation, achieving a dense electrolyte with comparable ionic conductivity. Among these, the Ce₀.₇₉Gd₀.₁₅Ca₀.₀₅Cu₀.₀₁O<sub><b>2-δ</b></sub> electrolyte demonstrated the highest conductivity, showing a tenfold increase compared to conventional Ce<sub>0.79</sub>Gd<sub>0.2-x</sub>Ca<sub>x</sub>Cu<sub>0.01</sub>O<sub>2-δ</sub> electrolytes, with a conductivity of 0.054&#xa0;S·cm⁻¹ at 800&#xa0;°C and an activation energy of 0.88&#xa0;eV.</p>

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Evaluation of the microstructure and the electrochemical properties of Ce0.79Gd0.2-xCaxCu0.01O2−δ electrolytes for IT-SOFCs

  • 期刊论文

  • 发表日期：

    2026年1月28日

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  • Jie Yang,
  • Xuechun Song,
  • Jinlei Meng,
  • Jingchen Sun

摘要

Doped ceria electrolytes are extensively studied and applied in intermediate-low temperature solid oxide fuel cell (IT-SOFC). Ce0.79Gd0.2-xCaxCu0.01O2-δ electrolytes were synthesized by the ultrasonic-assisted sol-gel self combustion sintering method. The experimental results demonstrate that incorporating 1.0 mol% Cu into gadolinium-doped ceria (GDC) enables a reduction in sintering temperature by 500 °C, while Ca co-doping effectively increases oxygen vacancy formation, achieving a dense electrolyte with comparable ionic conductivity. Among these, the Ce₀.₇₉Gd₀.₁₅Ca₀.₀₅Cu₀.₀₁O2-δ electrolyte demonstrated the highest conductivity, showing a tenfold increase compared to conventional Ce0.79Gd0.2-xCaxCu0.01O2-δ electrolytes, with a conductivity of 0.054 S·cm⁻¹ at 800 °C and an activation energy of 0.88 eV.