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<p>Solid oxide-ion conductors are key functional materials in high-temperature (&gt;500 °C) electrochemical energy technologies, such as solid oxide fuel cells. Operating these devices at lower temperatures could simplify system design, reduce degradation and broaden material options, but few conductors exhibit sufficient ion mobility in this regime. Here we report a family of oxide-ion conductors based on ((Na<sub>0.5</sub>Bi<sub>0.5</sub>)<sub><i>n</i>–1</sub>Ti<sub><i>n</i></sub>O<sub>3<i>n</i></sub>)(Bi<sub>2</sub>O<sub>2</sub>) (where <i>n</i> = 4, 5, 7 and 8) Aurivillius-type thin films with promising low-temperature performance. These Aurivillius phases, characterized by periodic bismuth oxide layers and a tetragonally distorted Na<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub> lattice, establish well-defined periodic fast ion-conducting channels allowing ionic conductivity of 0.025 S cm<sup>−1</sup> at 350 °C. Combining atomic-scale electron ptychography imaging with first-principles calculations, we attribute these intriguing properties to localized lattice stretching and the unique dual-ion conduction pathways induced by the specific bismuth oxide intercalation. Based on this design, we constructed fuel cells that achieve a maximum power density of 0.726 W cm<sup>−2</sup> at 400 °C, showing promising potential for technological applications.</p>

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Low-temperature oxide-ion conduction in Aurivillius-type ((Na0.5Bi0.5)n–1TinO3n)(Bi2O2) phases

  • 期刊论文

  • 发表日期：

    2026年7月23日

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  • Chuanrui Huo,
  • Shiqing Deng,
  • Liyang Ma,
  • Jizhe Cui,
  • Kun Xu,
  • Tianyu Li,
  • Feixiang Long,
  • Jianghua Chen,
  • Yimei Zhu,
  • Rong Yu,
  • Zongping Shao,
  • Shi Liu,
  • Jun Chen

摘要

Solid oxide-ion conductors are key functional materials in high-temperature (>500 °C) electrochemical energy technologies, such as solid oxide fuel cells. Operating these devices at lower temperatures could simplify system design, reduce degradation and broaden material options, but few conductors exhibit sufficient ion mobility in this regime. Here we report a family of oxide-ion conductors based on ((Na0.5Bi0.5)n–1TinO3n)(Bi2O2) (where n = 4, 5, 7 and 8) Aurivillius-type thin films with promising low-temperature performance. These Aurivillius phases, characterized by periodic bismuth oxide layers and a tetragonally distorted Na0.5Bi0.5TiO3 lattice, establish well-defined periodic fast ion-conducting channels allowing ionic conductivity of 0.025 S cm−1 at 350 °C. Combining atomic-scale electron ptychography imaging with first-principles calculations, we attribute these intriguing properties to localized lattice stretching and the unique dual-ion conduction pathways induced by the specific bismuth oxide intercalation. Based on this design, we constructed fuel cells that achieve a maximum power density of 0.726 W cm−2 at 400 °C, showing promising potential for technological applications.