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<p>Proton conducting ceramic cells enable efficient electrocatalytic H<sub>2</sub>-to-power conversion, yet their perovskite air electrodes demand versatile properties: high bulk proton uptake/conductivity, fast surface oxygen kinetics, and operational stability. Conventional single-phase perovskites usually fail to meet these demands simultaneously. Here, we show a facile strategy that couples bulk cation migration with surface segregation to enhance the versatility of the air electrode. The as-prepared (Ba<sub>0.9</sub>Ce<sub>0.1-α</sub>)(Ce<sub>α</sub>Fe<sub>0.8</sub>Ni<sub>0.2-β</sub>)O<sub>3-δ</sub>-βNiO (cm-BCFN@NiO) electrode features a coupled bulk–surface architecture where finely dispersed NiO nanoparticles and Ce migration from A-sites to B-sites synergistically optimize surface oxygen kinetics, bulk proton uptake/conductivity, and electronic transport. The optimized electrode exhibits a low area-specific resistance of 0.3 Ω cm<sup>2</sup> at 550 °C—a 75% reduction compared to the NiO-free counterpart—enabling a 77.1% increase in maximum power density and over 1200 hours of stable single-cell operation. Beyond protonic ceramic cells, this work presents an approach for designing perovskites by leveraging cation migration and surface segregation at the atomic scale, opening more opportunities for a wide range of electrocatalytic applications.</p>

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Coupling cation migration with segregation for versatile air electrode in proton-conducting ceramic cells

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月4日

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  • Junda You,
  • Zhipeng Liu,
  • Yuan Zhang,
  • Suling Shen,
  • Hongxin Yang,
  • Junbiao Li,
  • Haojie Zhu,
  • Shuo Zhai,
  • Nai Shi,
  • Nanqi Li,
  • Yuchen Wu,
  • Jun Zhou,
  • Meijie Yin,
  • Qianling Zhang,
  • Minhua Shao,
  • Meng Ni,
  • Zongping Shao,
  • Bin Chen,
  • Heping Xie

摘要

Proton conducting ceramic cells enable efficient electrocatalytic H2-to-power conversion, yet their perovskite air electrodes demand versatile properties: high bulk proton uptake/conductivity, fast surface oxygen kinetics, and operational stability. Conventional single-phase perovskites usually fail to meet these demands simultaneously. Here, we show a facile strategy that couples bulk cation migration with surface segregation to enhance the versatility of the air electrode. The as-prepared (Ba0.9Ce0.1-α)(CeαFe0.8Ni0.2-β)O3-δ-βNiO (cm-BCFN@NiO) electrode features a coupled bulk–surface architecture where finely dispersed NiO nanoparticles and Ce migration from A-sites to B-sites synergistically optimize surface oxygen kinetics, bulk proton uptake/conductivity, and electronic transport. The optimized electrode exhibits a low area-specific resistance of 0.3 Ω cm2 at 550 °C—a 75% reduction compared to the NiO-free counterpart—enabling a 77.1% increase in maximum power density and over 1200 hours of stable single-cell operation. Beyond protonic ceramic cells, this work presents an approach for designing perovskites by leveraging cation migration and surface segregation at the atomic scale, opening more opportunities for a wide range of electrocatalytic applications.