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Simultaneous Performance and Stability Enhancement in Intermediate Temperature Solid Oxide Fuel Cells by

Sung Eun Jo1, SungHyun Jeon2, Hyong June Kim3

  • 1Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Pohang, 37673, South Korea.

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A new powder atomic layer deposition (ALD) method uniformly coats La0.6 Sr0.4 Co0.2 Fe0.8 O3 -δ (LSCF) powders with ZrO2. This enhances solid oxide fuel cell performance and durability.

Keywords:
LSCF(La0.6Sr0.4Co0.2Fe0.8O3−δ)atomic layer depositioncathodespowdersolid oxide fuel cells

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Porous structures are critical for high-performance electrochemical energy devices.
  • Achieving uniform functional coatings on complex porous materials, like those used in solid oxide fuel cells (SOFCs), is a significant challenge, even with advanced techniques like atomic layer deposition (ALD).
  • Degradation of electrode materials, such as La0.6 Sr0.4 Co0.2 Fe0.8 O3 -δ (LSCF), limits device lifespan and efficiency.

Purpose of the Study:

  • To develop a novel method for uniform functional coating of porous electrode materials.
  • To improve the performance and durability of solid oxide fuel cell (SOFC) electrodes.
  • To address the challenge of coating high-tortuosity structures with uniform functional layers.

Main Methods:

  • A powder atomic layer deposition (ALD) process was employed to coat La0.6 Sr0.4 Co0.2 Fe0.8 O3 -δ (LSCF) powders with ZrO2.
  • The powder ALD technique was specifically adapted to achieve uniform coatings on porous structures with thicknesses in the tens of micrometers.
  • Electrochemical performance and degradation of coated and uncoated LSCF cathodes were evaluated in SOFCs operating at 700-750 °C.

Main Results:

  • The powder ALD process successfully produced highly uniform ZrO2 coatings on LSCF powders.
  • The ZrO2 coating effectively mitigated chemical degradation of the LSCF electrodes.
  • SOFCs utilizing the powder ALD coated LSCF cathode exhibited a 2.2-fold increase in maximum power density and a 60% reduction in thermal degradation of activation resistance compared to bare LSCF cathodes.

Conclusions:

  • Powder ALD is a viable and effective method for creating uniform functional coatings on porous electrode materials for electrochemical devices.
  • ZrO2 coating via powder ALD significantly enhances the performance and durability of LSCF-based SOFC cathodes.
  • This approach holds substantial promise for developing high-performance, long-lasting electrodes for various energy conversion and storage applications.