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<p>Reversible solid oxide cells—devices that interconvert electricity and chemical fuels—commonly use composite air electrodes combining oxygen-ion-conducting Gd<sub>0.1</sub>Ce<sub>0.9</sub>O<sub>2–<i>δ</i></sub> (GDC) with an electronically conductive catalyst to maximize the three-phase boundaries and minimize interfacial resistance. Despite the effectiveness of this architecture, performance improvements have plateaued. Here, we demonstrate that replacing GDC with mixed proton-, oxygen-ion- and hole-conducting BaCe<sub>1</sub><sub>−<i>x</i></sub>Zr<sub><i>x</i></sub>O<sub>3</sub>-based materials (for example, BaCe<sub>0.7</sub>Zr<sub>0.1</sub>Y<sub>0.1</sub>Yb<sub>0.1</sub>O<sub>3−<i>δ</i></sub>, BCZYYb7111) balances the electronic and ionic conductivity of the composite electrode, altering the reaction pathway to a lower-barrier rate-determining-step, and expanding the electrochemically active region to the entire electrode surface. In a configuration where the highly active misfit-layered Gd<sub>0.3</sub>Ca<sub>2.7</sub>Co<sub>3.82</sub>Cu<sub>0.18</sub>O<sub>9</sub><sub>−<i>δ</i></sub> catalyst is composited with BCZYYb7111, the reversible solid oxide cell achieves 7.08 W cm<sup>−2</sup> in fuel-cell mode and –7.88 A cm<sup>−2</sup> at 1.3 V in electrolysis mode using an yttria-stabilized zirconia electrolyte at 800 °C. This compositing strategy also enhances the performance of other popular oxygen electrocatalysts.</p>

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Composite air electrodes based on BaCe0.7Zr0.1Y0.1Yb0.1O3−δ for reversible solid oxide cells

  • 期刊论文

  • 发表日期：

    2026年5月4日

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  • Kwangho Park,
  • WonJun Lee,
  • Junghyun Park,
  • Minkyeong Jo,
  • Yeongeun Bae,
  • Minji Kim,
  • Sejong Shin,
  • Jinuk Moon,
  • Ryan O’Hayre,
  • Jeong Woo Han,
  • Sun-Ju Song,
  • Jun-Young Park

摘要

Reversible solid oxide cells—devices that interconvert electricity and chemical fuels—commonly use composite air electrodes combining oxygen-ion-conducting Gd0.1Ce0.9O2–δ (GDC) with an electronically conductive catalyst to maximize the three-phase boundaries and minimize interfacial resistance. Despite the effectiveness of this architecture, performance improvements have plateaued. Here, we demonstrate that replacing GDC with mixed proton-, oxygen-ion- and hole-conducting BaCe1−xZrxO3-based materials (for example, BaCe0.7Zr0.1Y0.1Yb0.1O3−δ, BCZYYb7111) balances the electronic and ionic conductivity of the composite electrode, altering the reaction pathway to a lower-barrier rate-determining-step, and expanding the electrochemically active region to the entire electrode surface. In a configuration where the highly active misfit-layered Gd0.3Ca2.7Co3.82Cu0.18O9−δ catalyst is composited with BCZYYb7111, the reversible solid oxide cell achieves 7.08 W cm−2 in fuel-cell mode and –7.88 A cm−2 at 1.3 V in electrolysis mode using an yttria-stabilized zirconia electrolyte at 800 °C. This compositing strategy also enhances the performance of other popular oxygen electrocatalysts.