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<p>Electrolytes based on CeO<sub>2</sub> are widely used as film barriers between an oxide cathode and an electrolyte, as anode activators. The films are applied using both powder and film methods when developing electrochemical devices, such as solid oxide fuel cells (SOFCs), based on ZrO<sub>2</sub>-solid electrolytes. The authors elucidate that a pyrochlore phase Ce<sub>2</sub>Zr<sub>2</sub>O<sub><i>n</i></sub>, where <i>n</i> = 7, 7.5 or 8, depending on the cerium reduction degree, may form in both oxidation and reduction conditions at SOFC interfaces. It has been found that when the Zr0.80Sс0.18Y0.02O2−α (SсYSZ) electrolyte is coated with Ce0.8R0.2O2−a (R = Sm, Tb) (Се20R) films, followed by the sintering of the composite Ni+Ce0.8Sm0.2O2−a (Ni-SDC) anode at 1400 °С and reduction at 800 °С, a noticeable interfacial resistance appears. The minimum calculated thickness of this layer is 10 nm, assuming that the Ce2Zr2O7 pyrochlore structure is formed.</p>

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Influence of Ce0.8R0.2O2–a (R = Sm, Tb) submicron films on the properties of the SOFC anode boundary

  • 期刊论文

  • 发表日期：

    2026年7月17日

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  • A. I. Kovrova,
  • V. P. Gorelov,
  • E. S. Tropin,
  • M. S. Plekhanov

摘要

Electrolytes based on CeO2 are widely used as film barriers between an oxide cathode and an electrolyte, as anode activators. The films are applied using both powder and film methods when developing electrochemical devices, such as solid oxide fuel cells (SOFCs), based on ZrO2-solid electrolytes. The authors elucidate that a pyrochlore phase Ce2Zr2On, where n = 7, 7.5 or 8, depending on the cerium reduction degree, may form in both oxidation and reduction conditions at SOFC interfaces. It has been found that when the Zr0.80Sс0.18Y0.02O2−α (SсYSZ) electrolyte is coated with Ce0.8R0.2O2−a (R = Sm, Tb) (Се20R) films, followed by the sintering of the composite Ni+Ce0.8Sm0.2O2−a (Ni-SDC) anode at 1400 °С and reduction at 800 °С, a noticeable interfacial resistance appears. The minimum calculated thickness of this layer is 10 nm, assuming that the Ce2Zr2O7 pyrochlore structure is formed.