首页|Fluorine doping for the enhanced electrochemical performance of SrCo0·8Ti0·2O3-based perovskite cathode for Solid Oxide Cells

Fluorine doping for the enhanced electrochemical performance of SrCo0·8Ti0·2O3-based perovskite cathode for Solid Oxide Cells

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  • NETL
  • NSTL
  • Elsevier
© 2024Fluorine doping in the oxygen sublattice has been previously employed to modify the physicochemical properties of perovskite-type oxides. However, the underlying mechanism responsible for the observed enhancements remains unclear. In this study, we systematically investigate the effects of F-doping on the crystal structure, electronic properties, oxygen ion transport, and electrochemical performance of SrCo0·8Ti0·2O3-x-δFx cathodes through a combination of experimental and DFT theoretical computation methods. The results indicate that the samples retain a cubic structure, while F-doping reduces the valence state of Co and decreases the oxygen vacancy concentration. Although the thermal expansion coefficients of SCTFx remain unchanged, the electrical conductivity of the F-doped SCTF0.1 is improved. Partial substitution of F for O effectively increases the oxygen diffusion coefficient and reduces the polarization resistance in the charge transfer process, thereby enhancing the catalytic activity of the SCTF0.1 cathode. The polarization resistance of SCTF0.1 is as low as 0.050 Ω cm2 at 700 °C. Notably, the peak power densities of a full cell with the SCTF0.1 cathode exhibit a significant boost, particularly at lower temperatures. Theoretical calculations corroborate the experimental findings, demonstrating that F-doping effectively reduces the oxygen migration barrier. Overall, fluorine doping proves to be an effective strategy for optimizing SrCo0·8Ti0·2O3-based SOC cathodes.

Fluorine dopingOxygen reduction reactionPerovskite cathodeSolid oxide cellsSrCo0·8Ti0·2O3

Du Z.、Dong X.、Wang T.、Zhao H.、Swierczek K.

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School of Materials Science and Engineering University of Science and Technology Beijing||Beijing Municipal Key Lab for Advanced Energy Materials and Technologies

School of Materials Science and Engineering University of Science and Technology Beijing

School of Materials Science and Engineering University of Science and Technology BeijingSchool of Materials Science and Engineering University of Science and Technology Beijing||Beijing Municipal Key Lab for Advanced Energy Materials and Technologies||

Faculty of Energy and Fuels AGH University of Krakow

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2025

10.1016/j.ijhydene.2024.12.192

International journal of hydrogen energy

International journal of hydrogen energy

ISSN：0360-3199
年,卷(期)：2025.99(Jan.)
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