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<p>Perovskite-type polycrystalline proton-conducting BaCe<sub>0.5</sub>Zr<sub>0.3</sub>Y<sub>0.1</sub>A<sub>0.05</sub>Zn<sub>0.05</sub>O<sub>3-δ</sub> (A = Gd, Sm) has been synthesized using a solid-state reaction method for the application in intermediate temperature solid oxide fuel cell (IT-SOFC). These materials were characterized by X-ray powder diffraction (XRPD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and electrochemical impedance analysis (EIS). Rietveld analysis of the XRPD data shows that these materials crystallize in the cubic symmetry in the <i>Pm-3&#xa0;m</i> space group. SEM image analysis confirms the well-crystallized high-density materials, and TGA shows these as thermally stable up to 900&#xa0;°C. EIS measurements at 700&#xa0;°C show the beneficial ionic conductivities. In wet 5% hydrogen, the ionic conductivities were 1.29 × 10<sup>−3</sup> Scm<sup>−1</sup> and 5.95 × 10<sup>−5</sup> Scm<sup>−1</sup> for BaCe<sub>0.5</sub>Zr<sub>0.3</sub>Y<sub>0.1</sub>Gd<sub>0.05</sub>Zn<sub>0.05</sub>O<sub>3-δ</sub> (BCZYGdZn) and BaCe<sub>0.5</sub>Zr<sub>0.3</sub>Y<sub>0.1</sub>Sm<sub>0.05</sub>Zn<sub>0.05</sub>O<sub>3-δ</sub> (BCZYSmZn), respectively. In contrast, the ionic conductivities of BaCe<sub>0.5</sub>Zr<sub>0.3</sub>Y<sub>0.1</sub>Gd<sub>0.05</sub>Zn<sub>0.05</sub>O<sub>3-δ</sub> (BCZYGdZn) and BaCe<sub>0.5</sub>Zr<sub>0.3</sub>Y<sub>0.1</sub>Sm<sub>0.05</sub>Zn<sub>0.05</sub>O<sub>3-δ</sub> (BCZYSmZn) in dry hydrogen were 1.30 × 10<sup>−3</sup> Scm<sup>−1</sup> and 4.71 × 10<sup>−5</sup> Scm<sup>−1</sup>, respectively. The calculated activation energies in wet 5% hydrogen were 0.38&#xa0;eV and 0.40&#xa0;eV for BCZYGdZn and BCZYSmZn, respectively. Hence, both materials are promising electrolytes in IT-SOFC.</p>

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Highly dense and thermally stable BaCe0.5Zr0.3Y0.1A0.05 Zn0.05O3−δ (A = Gd, Sm) electrolyte for intermediate temperature solid oxide fuel cell (IT-SOFC)

  • 期刊论文

  • 发表日期：

    2025年1月17日

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  • Md.Mosfiqur Rahman,
  • Abdalla M. Abdalla,
  • Lukman Ahmed Omeiza,
  • Veena Raj,
  • Minh Thang Le,
  • Bo Wei,
  • Abul Kalam Azad

摘要

Perovskite-type polycrystalline proton-conducting BaCe0.5Zr0.3Y0.1A0.05Zn0.05O3-δ (A = Gd, Sm) has been synthesized using a solid-state reaction method for the application in intermediate temperature solid oxide fuel cell (IT-SOFC). These materials were characterized by X-ray powder diffraction (XRPD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and electrochemical impedance analysis (EIS). Rietveld analysis of the XRPD data shows that these materials crystallize in the cubic symmetry in the Pm-3 m space group. SEM image analysis confirms the well-crystallized high-density materials, and TGA shows these as thermally stable up to 900 °C. EIS measurements at 700 °C show the beneficial ionic conductivities. In wet 5% hydrogen, the ionic conductivities were 1.29 × 10−3 Scm−1 and 5.95 × 10−5 Scm−1 for BaCe0.5Zr0.3Y0.1Gd0.05Zn0.05O3-δ (BCZYGdZn) and BaCe0.5Zr0.3Y0.1Sm0.05Zn0.05O3-δ (BCZYSmZn), respectively. In contrast, the ionic conductivities of BaCe0.5Zr0.3Y0.1Gd0.05Zn0.05O3-δ (BCZYGdZn) and BaCe0.5Zr0.3Y0.1Sm0.05Zn0.05O3-δ (BCZYSmZn) in dry hydrogen were 1.30 × 10−3 Scm−1 and 4.71 × 10−5 Scm−1, respectively. The calculated activation energies in wet 5% hydrogen were 0.38 eV and 0.40 eV for BCZYGdZn and BCZYSmZn, respectively. Hence, both materials are promising electrolytes in IT-SOFC.