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<p>Due to the microstructural degradation of fuel electrodes, high cycling stability and catalytic activity remain a significant barrier for solid&#xa0;oxide electrolysis cells (SOEC). Perovskite materials exhibit favorable mixed conductivity and redox stability as cathode materials, but their catalytic activity is not ideal. This study systematically investigates the structural, morphological, and electrochemical properties of cobalt doping in the Pr<sub>0.4</sub>Sr<sub>0.6</sub>Co<sub><i>x</i></sub>Fe<sub>1-<i>x</i></sub>O<sub>3-<i>δ</i></sub> (PSC<sub><i>x</i></sub>F) system, characterized using scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, CO<sub>2</sub>-temperature-programmed desorption, and Raman spectroscopy. The effect of cobalt-doping concentration on the electrochemical properties was further investigated. The electrochemical performance evaluation demonstrates that the optimal is achieved with a cobalt-doping ratio of 0.1. At 800&#xa0;°C and 1.5&#xa0;V, the CO<sub>2</sub> electrolysis current density of the PSC<sub>0.1</sub>F-Gd<sub>0.1</sub>Ce<sub>0.9</sub>O<sub>2-<i>δ</i></sub> (GDC)|GDC|Sc<sub>0.1</sub>Zr<sub>0.9</sub>O<sub>2-<i>δ</i></sub>|GDC|La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.2</sub>Fe<sub>0.8</sub>O<sub>3+<i>δ</i></sub> full cell reaches 1.37&#xa0;A·cm<sup>−2</sup>, approximately 34.3% higher than that of electrodes without cobalt doping. Furthermore, the electrode maintains stability for over 100&#xa0;h at 800&#xa0;°C and 1.3&#xa0;V. This work offers new insights into how metal doping can be applied to regulate electrode structures, thereby providing enhanced performance and stability for perovskite-based fuel electrodes.</p>

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Cobalt-doped Pr0.4Sr0.6FeO3-δ as an efficient fuel electrode for electrolysis of CO2 in solid-oxide electrolysis cells

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Chao Han,
  • Na Gao,
  • Huichao Yao,
  • Ruizhu Li,
  • Chengguo Ma,
  • Yue Wang,
  • Tao Li,
  • Xiulin Wang,
  • Jian-Qiang Wang,
  • Guoping Xiao

摘要

Due to the microstructural degradation of fuel electrodes, high cycling stability and catalytic activity remain a significant barrier for solid oxide electrolysis cells (SOEC). Perovskite materials exhibit favorable mixed conductivity and redox stability as cathode materials, but their catalytic activity is not ideal. This study systematically investigates the structural, morphological, and electrochemical properties of cobalt doping in the Pr0.4Sr0.6CoxFe1-xO3-δ (PSCxF) system, characterized using scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, CO2-temperature-programmed desorption, and Raman spectroscopy. The effect of cobalt-doping concentration on the electrochemical properties was further investigated. The electrochemical performance evaluation demonstrates that the optimal is achieved with a cobalt-doping ratio of 0.1. At 800 °C and 1.5 V, the CO2 electrolysis current density of the PSC0.1F-Gd0.1Ce0.9O2-δ (GDC)|GDC|Sc0.1Zr0.9O2-δ|GDC|La0.6Sr0.4Co0.2Fe0.8O3+δ full cell reaches 1.37 A·cm−2, approximately 34.3% higher than that of electrodes without cobalt doping. Furthermore, the electrode maintains stability for over 100 h at 800 °C and 1.3 V. This work offers new insights into how metal doping can be applied to regulate electrode structures, thereby providing enhanced performance and stability for perovskite-based fuel electrodes.