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<p>Developing highly active and stable air electrodes remains challenging for reversible solid oxide cells (R-SOCs). Herein, we report an A-site high-entropy engineered perovskite oxide, La<sub>0.2</sub>Pr<sub>0.2</sub>Nd<sub>0.2</sub>Ba<sub>0.2</sub>Sr<sub>0.2</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−<i>δ</i></sub> (HE-LSCF), and its electrocatalytic activity and stability property are systematically probed for tubular R-SOCs. The HE-LSCF air electrode exhibits excellent oxygen reduction reaction (ORR) activity with a low polarization resistance of 0.042 Ω·cm<sup>2</sup> at 700°C, which is much lower than that of La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−<i>δ</i></sub> (LSCF), indicating the excellent catalytic activity of HE-LSCF. Meanwhile, the tubular R-SOCs with HE-LSCF shows a high peak power density of 1.18 W·cm<sup>−2</sup> in the fuel cell mode and a promising electrolysis current density of −0.52 A·cm<sup>−2</sup> at 1.5 V in the electrolysis mode with H<sub>2</sub> (∼10% H<sub>2</sub>O) atmosphere at 700°C. More importantly, the tubular R-SOCs with HE-LSCF shows favorable stability under 180 h reversible cycling test. Our results show the high-entropy design can significantly enhance the activity and robustness of LSCF electrode for tubular R-SOCs.</p>

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A high-entropy engineered perovskite oxide for efficient and stable LSCF-based air electrode of tubular reversible solid oxide cells

  • 期刊论文

  • 发表日期：

    2025年11月5日

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  • Shiyue Zhu,
  • Tian Li,
  • Ruoyu Li,
  • Xiaoyong Lu,
  • Yihan Ling,
  • Dong Tian

摘要

Developing highly active and stable air electrodes remains challenging for reversible solid oxide cells (R-SOCs). Herein, we report an A-site high-entropy engineered perovskite oxide, La0.2Pr0.2Nd0.2Ba0.2Sr0.2Co0.8Fe0.2O3−δ (HE-LSCF), and its electrocatalytic activity and stability property are systematically probed for tubular R-SOCs. The HE-LSCF air electrode exhibits excellent oxygen reduction reaction (ORR) activity with a low polarization resistance of 0.042 Ω·cm2 at 700°C, which is much lower than that of La0.6Sr0.4Co0.8Fe0.2O3−δ (LSCF), indicating the excellent catalytic activity of HE-LSCF. Meanwhile, the tubular R-SOCs with HE-LSCF shows a high peak power density of 1.18 W·cm−2 in the fuel cell mode and a promising electrolysis current density of −0.52 A·cm−2 at 1.5 V in the electrolysis mode with H2 (∼10% H2O) atmosphere at 700°C. More importantly, the tubular R-SOCs with HE-LSCF shows favorable stability under 180 h reversible cycling test. Our results show the high-entropy design can significantly enhance the activity and robustness of LSCF electrode for tubular R-SOCs.