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<p>Achieving high ionic conductivity and long-term stability at the medium/low temperature range, i.e., 300–600&#xa0;°C, is the development trend of solid oxide fuel cells (SOFCs). Herein, we utilized a rhombohedral perovskite LaAlO<sub>3</sub> via Sr<sup>2+</sup> doping to tune its ionic conductivity, as a pristine electrolyte precursor La<sub>1 − x</sub>Sr<sub>x</sub>AlO<sub>3−δ</sub> (LSAO), and simultaneously employed the Ni<sub>0.8</sub>Co<sub>0.15</sub>Al<sub>0.05</sub>LiO<sub>2−δ</sub> (NCAL) as both cathode and anode to assemble fuel cells. The molten lithium-containing compound (i.e., LiOH/Li<sub>2</sub>CO<sub>3</sub>), generated inside the electrode and subsequently infiltrated through the electrolyte, can composite with LSAO at elevated working temperatures (e.g., 550&#xa0;°C) to produce a LSAO/Li<sub>2</sub>CO<sub>3</sub> heterostructure. This was beneficial to the gas tightness of the electrolyte layer and simultaneously established a pathway for proton migration alon<i>g</i> the heterointerfaces. Consequently, a single fuel cell device utilizing the <i>in-situ</i> forming LSAO/Li<sub>2</sub>CO<sub>3</sub> heterogeneous electrolyte achieves a peak power density (PPD) of 1010 mW cm<sup>− 2</sup> with an OCV of 1.10&#xa0;V at 550&#xa0;°C. Through <i>in-situ</i> construction, this work explores a novel approach to designing heterogeneous electrolytes for low temperature (LT)-SOFCs.</p>

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In-situ construction of La1 − xSrxAlO3−δ/Li2CO3 electrolyte for low-temperature solid oxide fuel cells

  • 期刊论文

  • 发表日期：

    2026年1月30日

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  • Amna Nisar,
  • Fangzhou Lv,
  • Shaozheng Ji,
  • Yongfu Tang,
  • Yanyan Liu

摘要

Achieving high ionic conductivity and long-term stability at the medium/low temperature range, i.e., 300–600 °C, is the development trend of solid oxide fuel cells (SOFCs). Herein, we utilized a rhombohedral perovskite LaAlO3 via Sr2+ doping to tune its ionic conductivity, as a pristine electrolyte precursor La1 − xSrxAlO3−δ (LSAO), and simultaneously employed the Ni0.8Co0.15Al0.05LiO2−δ (NCAL) as both cathode and anode to assemble fuel cells. The molten lithium-containing compound (i.e., LiOH/Li2CO3), generated inside the electrode and subsequently infiltrated through the electrolyte, can composite with LSAO at elevated working temperatures (e.g., 550 °C) to produce a LSAO/Li2CO3 heterostructure. This was beneficial to the gas tightness of the electrolyte layer and simultaneously established a pathway for proton migration along the heterointerfaces. Consequently, a single fuel cell device utilizing the in-situ forming LSAO/Li2CO3 heterogeneous electrolyte achieves a peak power density (PPD) of 1010 mW cm− 2 with an OCV of 1.10 V at 550 °C. Through in-situ construction, this work explores a novel approach to designing heterogeneous electrolytes for low temperature (LT)-SOFCs.