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Overcoming chromium poisoning in solid oxide cells through multiscale perovskite engineering.

Min Li1, Huixian Liu2, Yunfei Bu3,4

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A novel triple barrier design enhances oxygen electrodes for reversible solid oxide cells, overcoming chromium poisoning and improving oxygen kinetics. This breakthrough offers stable, high-performance operation in challenging environments.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemical Engineering

Background:

  • Oxygen electrodes in reversible solid oxide cells suffer from performance limitations due to chromium poisoning and slow oxygen kinetics.
  • Strontium (Sr) segregation and chromium-induced degradation are key challenges impacting electrode durability and efficiency.

Purpose of the Study:

  • To develop a triple barrier design for oxygen electrodes that enhances stability and performance by mitigating chromium poisoning and improving oxygen reaction kinetics.
  • To investigate the mechanisms behind chromium tolerance and activity enhancement in the modified electrode material.

Main Methods:

  • Fabrication of a novel perovskite oxide La0.6Sr0.1Ba0.35Co0.2Fe0.78Mo0.02O3₋δ with a triple barrier structure.
  • Electrochemical characterization including polarization resistance measurements at various temperatures.
  • Long-term stability testing under operating conditions with a chromium source.
  • Thermodynamic analysis and Density Functional Theory (DFT) calculations to elucidate performance mechanisms.

Main Results:

  • The engineered electrode achieved a polarization resistance of 0.058 Ω·cm2 at 750°C, a 70.4% reduction compared to LSCF.
  • Achieved high power density (1.352 W·cm⁻² at 800°C) and current density (2.08 A·cm⁻² at 1.5 V).
  • Demonstrated stable operation for approximately 1000 hours under a chromium source at 0.5 A·cm⁻².
  • Suppressed SrCrO4 formation and reduced chromium ingress, attributed to BaCoO3 nanodomains and Mo-mediated surface acidity.

Conclusions:

  • The triple barrier design effectively suppresses chromium poisoning and enhances oxygen kinetics in reversible solid oxide cell electrodes.
  • The integration of Ba for lattice stabilization, BaCoO3 for chromium trapping, and Mo for surface tuning reconciles high activity with chromium tolerance.
  • This design strategy is promising for developing durable and high-performance oxygen electrodes for various electrochemical applications.