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<p>(Sc<sub>2</sub>O<sub>3</sub>)<sub>0.1</sub>(CeO<sub>2</sub>)<sub>0.01</sub>(ZrO<sub>2</sub>)<sub>0.89</sub> possesses excellent ionic conductivity among various stabilized ZrO<sub>2</sub> electrolyte materials for solid oxide fuel cells. However, its practical application is limited by susceptibility to phase transition and the high cost of Sc<sub>2</sub>O<sub>3</sub> raw material. Herein, we address these challenges by partially replacing Sc<sub>2</sub>O<sub>3</sub> in (Sc<sub>2</sub>O<sub>3</sub>)<sub>0.1</sub>(CeO<sub>2</sub>)<sub>0.01</sub>(ZrO<sub>2</sub>)<sub>0.89</sub> with lowcost Yb<sub>2</sub>O<sub>3</sub>. Quaternary (Yb<sub>2</sub>O<sub>3</sub>)<sub><i>x</i></sub>(Sc<sub>2</sub>O<sub>3</sub>)<sub>0.10−<i>x</i></sub>(CeO<sub>2</sub>)<sub>0.01</sub> (ZrO<sub>2</sub>)<sub>0.89</sub> (<i>x</i> = 0.04–0.10) electrolyte discs are fabricated by coupling tape casting and <i>in situ</i> solid-state reaction. All Yb<sub>2</sub>O<sub>3</sub> doped electrolytes exhibit a single cubic phase structure. With increasing in Yb<sub>2</sub>O<sub>3</sub> amount, the grain boundary resistance decreases, leading to improved conductivity at low temperatures. (Yb<sub>2</sub>O<sub>3</sub>)<sub>0.06</sub>(Sc<sub>2</sub>O<sub>3</sub>)<sub>0.04</sub> (CeO<sub>2</sub>)<sub>0.01</sub>(ZrO<sub>2</sub>)<sub>0.89</sub> exhibits the ionic conductivity of 0.088 and 0.0020 S·cm<sup>−1</sup> at 800 and 500 °C, respectively. In addition, both the thermal expansion coefficient and three-point bending strength of the electrolytes increase with higher Yb<sub>2</sub>O<sub>3</sub> amount, satisfying the criteria for advanced electrolyte materials in solid oxide fuel cells. A single cell configuration comprising a Ni-Gd<sub>0.2</sub>Ce<sub>0.8</sub>O<sub>1.9</sub> anode∣200 µm thick (Yb<sub>2</sub>O<sub>3</sub>)<sub>0.06</sub>(Sc<sub>2</sub>O<sub>3</sub>)<sub>0.04</sub>(CeO<sub>2</sub>)<sub>0.01</sub> (ZrO<sub>2</sub>)<sub>0.89</sub>∣La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.2</sub>Fe<sub>0.8</sub>O<sub>3</sub> cathode achieves a peak power density of 0.65 W·cm<sup>−2</sup> at 800 °C and operates stably for 100 h without noticeable degradation. The present findings provide a new approach for the development of cost-effective and highly conductive ZrO<sub>2</sub>-based electrolyte for efficient and durable solid oxide fuel cells.</p>

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Highly conductive and cost-effective quaternary (Yb2O3)x(Sc2O3)0.10−x(CeO2)0.01(ZrO2)0.89 (x = 0.04–0.10) electrolytes for efficient and durable solid oxide fuel cells

  • 期刊论文

  • 发表日期：

    2026年1月8日

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  • Zhiyi Chen,
  • Fujun Liang,
  • Jiongyuan Huang,
  • Changgen Lin,
  • Jiaqi Qian,
  • Na Ai,
  • Chengzhi Guan,
  • Kongfa Chen,
  • Jiujun Zhang

摘要

(Sc2O3)0.1(CeO2)0.01(ZrO2)0.89 possesses excellent ionic conductivity among various stabilized ZrO2 electrolyte materials for solid oxide fuel cells. However, its practical application is limited by susceptibility to phase transition and the high cost of Sc2O3 raw material. Herein, we address these challenges by partially replacing Sc2O3 in (Sc2O3)0.1(CeO2)0.01(ZrO2)0.89 with lowcost Yb2O3. Quaternary (Yb2O3)x(Sc2O3)0.10−x(CeO2)0.01 (ZrO2)0.89 (x = 0.04–0.10) electrolyte discs are fabricated by coupling tape casting and in situ solid-state reaction. All Yb2O3 doped electrolytes exhibit a single cubic phase structure. With increasing in Yb2O3 amount, the grain boundary resistance decreases, leading to improved conductivity at low temperatures. (Yb2O3)0.06(Sc2O3)0.04 (CeO2)0.01(ZrO2)0.89 exhibits the ionic conductivity of 0.088 and 0.0020 S·cm−1 at 800 and 500 °C, respectively. In addition, both the thermal expansion coefficient and three-point bending strength of the electrolytes increase with higher Yb2O3 amount, satisfying the criteria for advanced electrolyte materials in solid oxide fuel cells. A single cell configuration comprising a Ni-Gd0.2Ce0.8O1.9 anode∣200 µm thick (Yb2O3)0.06(Sc2O3)0.04(CeO2)0.01 (ZrO2)0.89∣La0.6Sr0.4Co0.2Fe0.8O3 cathode achieves a peak power density of 0.65 W·cm−2 at 800 °C and operates stably for 100 h without noticeable degradation. The present findings provide a new approach for the development of cost-effective and highly conductive ZrO2-based electrolyte for efficient and durable solid oxide fuel cells.