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<p>In recent years, double perovskite structured materials have emerged as promising cathode materials for Intermediate-Temperature Solid Oxide Fuel Cells (IT-SOFCs), with PrBa<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>1.5</sub>Fe<sub>0.5</sub>O<sub>5+δ</sub> (PBSCF) demonstrating exceptional performance. This study investigates the impact of gadolinium (Gd) doping in PBSCF, forming Pr<sub>x</sub>Gd<sub>1-x</sub>Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>1.5</sub>Fe<sub>0.5</sub>O<sub>5+δ</sub> (PGBSCF) with x = 0, 0.25, 0.5, 0.75, and 1. X-ray diffraction (XRD) confirmed the tetragonal crystal structure across all PGBSCF compositions. Microstructural analysis via Field Emission Scanning Electron Microscopy (FE-SEM), porosity distribution assessments, and Coefficient of Thermal Expansion (CTE) measurements using a Thermal Mechanical Analyzer (TMA) were conducted. The four-point probe method evaluated electronic conductivity, while Electrochemical Impedance Spectroscopy (EIS) assessed cathode resistance in PGBSCF|SDC|PGBSCF symmetrical cells. Results indicate electronic conductivities of 132.4 S cm<sup>−1</sup> for GBSCF and 427.8 S cm<sup>−1</sup> for PBSCF at 600℃ in air, with a decrease in conductivity as praseodymium content increased. This study highlights the structural and electrochemical property variations with different praseodymium and gadolinium ratios, providing insights into optimizing IT-SOFC cathode materials.</p> Graphical abstract <p></p>

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Enhanced electrochemical properties of PrxGd1-xBa0.5Sr0.5Co1.5Fe0.5O5+δ double perovskite cathode material for solid oxide fuel cell

  • 期刊论文

  • 发表日期：

    2025年6月11日

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  • I-Ming Hung,
  • Debabrata Mohanty,
  • Yi-Wen Chen,
  • Yu-Rou Lin,
  • Chung-Jen Tseng,
  • Sheng-Wei Lee

摘要

In recent years, double perovskite structured materials have emerged as promising cathode materials for Intermediate-Temperature Solid Oxide Fuel Cells (IT-SOFCs), with PrBa0.5Sr0.5Co1.5Fe0.5O5+δ (PBSCF) demonstrating exceptional performance. This study investigates the impact of gadolinium (Gd) doping in PBSCF, forming PrxGd1-xBa0.5Sr0.5Co1.5Fe0.5O5+δ (PGBSCF) with x = 0, 0.25, 0.5, 0.75, and 1. X-ray diffraction (XRD) confirmed the tetragonal crystal structure across all PGBSCF compositions. Microstructural analysis via Field Emission Scanning Electron Microscopy (FE-SEM), porosity distribution assessments, and Coefficient of Thermal Expansion (CTE) measurements using a Thermal Mechanical Analyzer (TMA) were conducted. The four-point probe method evaluated electronic conductivity, while Electrochemical Impedance Spectroscopy (EIS) assessed cathode resistance in PGBSCF|SDC|PGBSCF symmetrical cells. Results indicate electronic conductivities of 132.4 S cm−1 for GBSCF and 427.8 S cm−1 for PBSCF at 600℃ in air, with a decrease in conductivity as praseodymium content increased. This study highlights the structural and electrochemical property variations with different praseodymium and gadolinium ratios, providing insights into optimizing IT-SOFC cathode materials.

Graphical abstract