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<p>Engineering dynamic heterointerfaces with atomic precision is critical for unlocking the full potential of reversible protonic ceramic electrochemical cells in sustainable energy conversion, while minimizing precious metal use in composite electrodes. Here, we introduce an atomic trapping strategy that restructures the interfacial chemistry of Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3-δ</sub> perovskite and Ru@CeO<sub>2-δ</sub> fluorite heteroelectrodes, achieving catalytic synergy through manipulating Ru coordination environment. A scalable co-sintering protocol induces thermodynamically driven Ru migration from the CeO<sub>2</sub> lattice into the perovskite matrix, creating coupled interfaces. This optimizes interfacial electron redistribution, generates interfacial oxygen vacancies, and improves triple conductivity and hydration kinetics. The electrode with low Ru loading exhibits bifunctionality, delivering a peak power density of 1.51 W cm<sup>−2</sup> and an electrolysis current density of −2.21 A cm<sup>−2</sup> at 650 °C. It demonstrates notable durability with minimal degradation (0.09 mV h<sup>−1</sup>) over 400 h at 600 °C, providing a universal strategy for next-generation solid-state energy devices.</p>

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Strategic atomic trapping at heterointerfaces for protonic ceramic cells

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月24日

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  • Zuoqing Liu,
  • Ruixi Qiao,
  • Desheng Feng,
  • Jin Zhou,
  • Haosong Di,
  • Yuesheng Bai,
  • Dongliang Liu,
  • Nai Shi,
  • Wei-Hsiang Huang,
  • Min-Hsin Yeh,
  • Chih-Wen Pao,
  • Zhiwei Hu,
  • Guangming Yang,
  • Yuxiao Lin,
  • Zhixin Luo,
  • Ran Ran,
  • Wei Zhou,
  • Yinlong Zhu,
  • Zongping Shao

摘要

Engineering dynamic heterointerfaces with atomic precision is critical for unlocking the full potential of reversible protonic ceramic electrochemical cells in sustainable energy conversion, while minimizing precious metal use in composite electrodes. Here, we introduce an atomic trapping strategy that restructures the interfacial chemistry of Ba0.5Sr0.5Co0.8Fe0.2O3-δ perovskite and Ru@CeO2-δ fluorite heteroelectrodes, achieving catalytic synergy through manipulating Ru coordination environment. A scalable co-sintering protocol induces thermodynamically driven Ru migration from the CeO2 lattice into the perovskite matrix, creating coupled interfaces. This optimizes interfacial electron redistribution, generates interfacial oxygen vacancies, and improves triple conductivity and hydration kinetics. The electrode with low Ru loading exhibits bifunctionality, delivering a peak power density of 1.51 W cm−2 and an electrolysis current density of −2.21 A cm−2 at 650 °C. It demonstrates notable durability with minimal degradation (0.09 mV h−1) over 400 h at 600 °C, providing a universal strategy for next-generation solid-state energy devices.