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Doping-Enabled Symmetry Control in BaCoO3 for Enhanced Oxygen Reduction Reaction.

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Stabilizing cubic perovskite structures in BaCoO3 (BCO) derivatives enhances solid oxide fuel cell (SOFC) cathode performance. Tantalum doping is most effective, significantly improving oxygen reduction kinetics by promoting the desired cubic phase.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid State Chemistry

Background:

  • Perovskite oxides are crucial for solid oxide fuel cell (SOFC) cathodes.
  • BaCoO3 (BCO) derivatives offer potential as mixed ionic-electronic conductors.
  • The hexagonal phase of BCO limits performance, necessitating transformation to the cubic phase.

Purpose of the Study:

  • To investigate the effect of doping on the hexagonal-to-cubic phase transition in BCO.
  • To determine how crystal structure influences oxygen reduction kinetics in BCO derivatives.
  • To identify optimal dopants for stabilizing the cubic phase and enhancing SOFC cathode performance.

Main Methods:

  • Systematic synthesis and characterization of seven BCO compositions (undoped, Sc, Y, Zr, Hf, Nb, Ta doped).
  • Analysis of the correlation between crystal structure (hexagonal vs. cubic) and oxygen reduction kinetics.
  • Evaluation of electrochemical performance, specifically polarization resistance.

Main Results:

  • The hexagonal-to-cubic phase transition is the key factor for oxygen reduction kinetics.
  • Tantalum (Ta) doping was most effective in promoting the cubic phase.
  • Ta-doped BCO achieved a low polarization resistance of ≈0.004 Ω cm² at 650 °C.
  • Cubic symmetry facilitated oxygen ion transport, vacancy formation, and surface adsorption.

Conclusions:

  • Chemical doping effectively stabilizes the cubic phase of BCO.
  • Crystal symmetry is a critical design parameter for tailoring perovskite oxide functionality.
  • Optimized BCO derivatives show promise for advanced electrochemical energy conversion devices like SOFCs.