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<p>Protonic ceramic electrochemical cells (PCECs) have potential as long-duration energy storage systems. However, their operational stability is limited under industrially relevant conditions due to the intrinsic chemical instability of doped barium cerate-based electrolytes and oxygen electrodes against H<sub>2</sub>O, as well as the poor electrode–electrolyte interfacial contact. Here we present a conformally coated scaffold (CCS) design to comprehensively address these issues. A porous proton-conducting scaffold is constructed and conformally coated with Pr<sub>1.8</sub>Ba<sub>0.2</sub>NiO<sub>4.1</sub> electrocatalyst, which has high chemical stability against H<sub>2</sub>O, triple conductivity and hydration capability, and protects vulnerable electrolytes from H<sub>2</sub>O. The CCS structure consolidates the electrode–electrolyte interfacial bonding to enable fast proton transfer in the percolated network. This design enables PCECs to reach electrolysis stability for 5,000 h at −1.5 A cm<sup>−2</sup> and 600 °C in 40% H<sub>2</sub>O. This work provides a general strategy to stabilize PCECs and offers guidance for designing resilient and stable solid-state energy storage systems.</p>

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Conformally coated scaffold design using water-tolerant Pr1.8Ba0.2NiO4.1 for protonic ceramic electrochemical cells with 5,000-h electrolysis stability

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • Hanchen Tian,
  • Wei Li,
  • Yueh-Lin Lee,
  • Hongkui Zheng,
  • Qingyuan Li,
  • Liang Ma,
  • Debangsu Bhattacharyya,
  • Xiujuan Chen,
  • Dawei Zhang,
  • Guosheng Li,
  • Yi Wang,
  • Li Li,
  • Qingsong Wang,
  • Fang Xia,
  • Muhammet Kartal,
  • Zhuozhao Shao,
  • Matthew R. Rowles,
  • Wenyuan Li,
  • Wissam A. Saidi,
  • Cijie Liu,
  • Xuemei Li,
  • Jian Luo,
  • Xiaolin Li,
  • Kai He,
  • Xingbo Liu

摘要

Protonic ceramic electrochemical cells (PCECs) have potential as long-duration energy storage systems. However, their operational stability is limited under industrially relevant conditions due to the intrinsic chemical instability of doped barium cerate-based electrolytes and oxygen electrodes against H2O, as well as the poor electrode–electrolyte interfacial contact. Here we present a conformally coated scaffold (CCS) design to comprehensively address these issues. A porous proton-conducting scaffold is constructed and conformally coated with Pr1.8Ba0.2NiO4.1 electrocatalyst, which has high chemical stability against H2O, triple conductivity and hydration capability, and protects vulnerable electrolytes from H2O. The CCS structure consolidates the electrode–electrolyte interfacial bonding to enable fast proton transfer in the percolated network. This design enables PCECs to reach electrolysis stability for 5,000 h at −1.5 A cm−2 and 600 °C in 40% H2O. This work provides a general strategy to stabilize PCECs and offers guidance for designing resilient and stable solid-state energy storage systems.