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<p>The work is devoted to the investigation of the influence of the nature of the electrolyte component of Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub>-based composite electrodes on their electrochemical activity. Composite electrodes with BaCe<sub>0.7</sub>Zr<sub>0.1</sub>Y<sub>0.1</sub>Yb<sub>0.1</sub>O<sub>3−δ</sub> and Ce<sub>0.8</sub>Sm<sub>0.2</sub>O<sub>2−δ</sub> electrolyte components were fabricated on the supporting proton-conducting electrolyte BaCe<sub>0.7</sub>Zr<sub>0.1</sub>Y<sub>0.1</sub>Yb<sub>0.1</sub>O<sub>3−δ.</sub> The electrochemical behavior of the electrodes was studied by impedance spectroscopy in the temperature range of 500–700 °C in an air atmosphere humidified with H<sub>2</sub>O and D<sub>2</sub>O. It was found that the electrochemical behavior of the composite electrodes relative to the electrode containing solely Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub> differs depending on the nature of the electrolyte component. The introduction of the oxygen-ionic conductor increases the polarization resistance of the electrodes and changes the electrode reaction mechanism, while the introduction of the protonic conductor leads to a decrease in the polarization resistance, and the electrode kinetics remains the same as for the electrode containing solely Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub>.</p> Graphical abstract <p></p>

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Influence of the nature of the electrolyte component in BSCF-based composite electrodes on the electrode kinetics: a comparative study

  • 期刊论文

  • 发表日期：

    2025年4月9日

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  • K. A. Fedorova,
  • E. V. Gordeev,
  • E. P. Antonova

摘要

The work is devoted to the investigation of the influence of the nature of the electrolyte component of Ba0.5Sr0.5Co0.8Fe0.2O3−δ-based composite electrodes on their electrochemical activity. Composite electrodes with BaCe0.7Zr0.1Y0.1Yb0.1O3−δ and Ce0.8Sm0.2O2−δ electrolyte components were fabricated on the supporting proton-conducting electrolyte BaCe0.7Zr0.1Y0.1Yb0.1O3−δ. The electrochemical behavior of the electrodes was studied by impedance spectroscopy in the temperature range of 500–700 °C in an air atmosphere humidified with H2O and D2O. It was found that the electrochemical behavior of the composite electrodes relative to the electrode containing solely Ba0.5Sr0.5Co0.8Fe0.2O3−δ differs depending on the nature of the electrolyte component. The introduction of the oxygen-ionic conductor increases the polarization resistance of the electrodes and changes the electrode reaction mechanism, while the introduction of the protonic conductor leads to a decrease in the polarization resistance, and the electrode kinetics remains the same as for the electrode containing solely Ba0.5Sr0.5Co0.8Fe0.2O3−δ.

Graphical abstract