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Development and Validation of Chromium Getters for Solid Oxide Fuel Cell Power Systems
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Sol-Gel Combustion-Assisted Electrostatic Spray Deposition for Durable Solid Oxide Fuel Cell Cathodes.

Jongseo Lee1, Sehee Bang2, Wonyoung Lee2

  • 1Advanced Defense Science and Technology Research Institute, Agency for Defense Development, Daejeon, South Korea.

Frontiers in Chemistry
|April 28, 2022
PubMed
Summary

Chemical instability in solid oxide fuel cells is addressed by a new heterostructured electrode. This La0.6Sr0.4CoO3-δ-Ce0.9Gd0.1O1.95 electrode shows significantly improved chemical and electrochemical stability for long-term operation.

Keywords:
electrostatic spray depositionperovskite oxidesol-gel combustionsolid oxide fuel cellsr segregation

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Conversion

Background:

  • Chemical instability of strontium-containing perovskite oxides hinders solid oxide fuel cell (SOFC) longevity.
  • Developing stable electrode materials is crucial for efficient and durable SOFCs.

Purpose of the Study:

  • To enhance the chemical and electrochemical stability of La0.6Sr0.4CoO3-δ (LSC) electrodes for SOFCs.
  • To investigate the effect of a Ce0.9Gd0.1O1.95 (GDC) coating on LSC stability.

Main Methods:

  • Fabrication of heterostructured LSC-GDC nanoparticles using single-step electrostatic spray deposition with a coaxial nozzle.
  • Incorporation of reducing fuel into the GDC precursor solution to induce sol-gel combustion and form nanocrystalline GDC coating.
  • Evaluation of electrode stability under a constant current density of 1 A/cm2 at 600°C for 100 hours.

Main Results:

  • Achieved uniform nanocrystalline GDC coating with high surface coverage on LSC nanoparticles.
  • Demonstrated remarkable improvement in chemical and electrochemical stability of the heterostructured LSC-GDC electrode compared to bare LSC.
  • The GDC coating significantly enhanced long-term stability under SOFC operating conditions.

Conclusions:

  • The heterostructured LSC-GDC electrode exhibits superior long-term stability for SOFC applications.
  • Electrostatic spray deposition is an effective method for creating stable, coated electrode materials.
  • High surface coverage of GDC is key to mitigating chemical degradation in LSC perovskites.