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<p>Protonic ceramic fuel cells (PCFCs) are promising for efficient, clean energy conversion at low to intermediate temperatures, but the widely used BaZr<sub>0.1</sub>Ce<sub>0.7</sub>Y<sub>0.1</sub>Yb<sub>0.1</sub>O<sub>3−<i>δ</i></sub> (BZCYYb) electrolyte has poor chemical stability in humid environments. Herein, we show that under oxygen reduction reaction (ORR) conditions, water accumulates at the BaGd<sub>0.8</sub>La<sub>0.2</sub>Co<sub>2</sub>O<sub>6−<i>δ</i></sub> (BGLC) cathode–BZCYYb electrolyte interface, causing selective loss of Ba cations and decomposition of BZCYYb electrolyte. The introduction of triply ion–electron conducting La<sub>2</sub>Ce<sub>2</sub>O<sub>7−<i>δ</i></sub> (LCeO) into the BGLC cathode expands its active reaction area, accelerates ORR kinetics, and suppresses water accumulation at the cathode–electrolyte interface and electrolyte decomposition. A single cell with the BGLC-LCeO composite cathode achieves a peak power density of 1.07 W cm<sup>−2</sup> at 700&#xa0;°C, with no profound degradation at 0.5 A cm<sup>−2</sup> over 100&#xa0;h. These findings provide guidance for the development of high-performance, durable PCFCs.</p> Graphical abstract <p></p>

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Mitigating the decomposition phenomenon at the cathode–electrolyte interface of protonic ceramic fuel cells

  • 期刊论文

  • 发表日期：

    2025年3月31日

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  • Xin-Rong Huang,
  • Jia-Qi Qian,
  • Hai-Peng Zhang,
  • Zhi-Yi Chen,
  • Chang-Gen Lin,
  • Jiong-Yuan Huang,
  • Na Ai,
  • Cheng-Zhi Guan,
  • San Ping Jiang,
  • Kong-Fa Chen

摘要

Protonic ceramic fuel cells (PCFCs) are promising for efficient, clean energy conversion at low to intermediate temperatures, but the widely used BaZr0.1Ce0.7Y0.1Yb0.1O3−δ (BZCYYb) electrolyte has poor chemical stability in humid environments. Herein, we show that under oxygen reduction reaction (ORR) conditions, water accumulates at the BaGd0.8La0.2Co2O6−δ (BGLC) cathode–BZCYYb electrolyte interface, causing selective loss of Ba cations and decomposition of BZCYYb electrolyte. The introduction of triply ion–electron conducting La2Ce2O7−δ (LCeO) into the BGLC cathode expands its active reaction area, accelerates ORR kinetics, and suppresses water accumulation at the cathode–electrolyte interface and electrolyte decomposition. A single cell with the BGLC-LCeO composite cathode achieves a peak power density of 1.07 W cm−2 at 700 °C, with no profound degradation at 0.5 A cm−2 over 100 h. These findings provide guidance for the development of high-performance, durable PCFCs.

Graphical abstract