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Redox Stability Optimization in Anode-Supported Solid Oxide Fuel Cells.

Yu Wang1, Ming Song2

  • 1College of Transportation, Shandong University of Science and Technology, Qingdao 266555, China.

Materials (Basel, Switzerland)
|July 13, 2024
PubMed
Summary
This summary is machine-generated.

Solid oxide fuel cells (SOFCs) with Ni-YSZ anodes face redox instability. An anode functional layer (AFL) can increase stress, but optimizing anode thickness improves stability.

Keywords:
anode functional layerredoxsolid oxide fuel cellstressthickness

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Mechanical Engineering

Background:

  • Solid oxide fuel cells (SOFCs) utilizing Ni-YSZ anodes are prone to degradation due to volume changes during redox cycling.
  • Oxidation of the Ni/NiO anode leads to expansion, inducing stress and potentially causing cell failure.

Purpose of the Study:

  • To develop an analytical model to investigate the impact of anode architecture on the redox stability of Ni-YSZ SOFCs.
  • To quantify the stress evolution in electrolyte and cathode layers under different anode configurations.

Main Methods:

  • Development of an analytical model to simulate stress distribution within SOFCs.
  • Parametric study on the influence of anode functional layer (AFL) and anode substrate thickness on stress.
  • Comparative analysis of stress in SOFCs with and without AFL.

Main Results:

  • SOFCs with an anode functional layer (AFL) exhibit increased tensile stresses (27.07% in electrolyte, 20.77% in cathode) after anode oxidation.
  • Anode thickness significantly influences structural stability; increasing anode substrate thickness reduces electrolyte and cathode stresses.
  • The anode substrate thickness is more critical for redox stability in SOFCs without an AFL.

Conclusions:

  • Anode structure design is crucial for enhancing redox stability in Ni-YSZ SOFCs.
  • Optimizing anode substrate thickness offers a viable strategy to mitigate stress-induced failure.
  • The findings provide a theoretical framework for designing more robust SOFCs for redox-tolerant operation.