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Probing and Mapping Electrode Surfaces in Solid Oxide Fuel Cells
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Self-Transforming Configuration Based on Atmospheric-Adaptive Materials for Solid Oxide Cells.

Seona Kim1, Seungtae Lee1, Junyoung Kim1

  • 1Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST) Ulsan, Ulsan, 44919, Republic of Korea.

Scientific Reports
|November 23, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel self-transforming solid oxide cell (SOC) using atmospheric-adaptive perovskite electrodes. This innovation achieves high performance in fuel cell mode and efficient operation in electrolysis, overcoming limitations of traditional symmetrical SOCs.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Conversion

Background:

  • Symmetrical solid oxide cells (SOCs) offer manufacturing advantages but suffer from lower performance compared to asymmetrical designs.
  • Achieving high performance in SOCs often requires dissimilar electrode materials, complicating fabrication and increasing costs.
  • Atmospheric-adaptive materials present a potential solution for high-performance, simplified SOC configurations.

Purpose of the Study:

  • To design and evaluate a novel 'self-transforming cell' utilizing a single, atmospheric-adaptive perovskite material for both electrodes.
  • To investigate the electrochemical performance and stability of this self-transforming cell in both fuel cell and electrolysis modes.
  • To demonstrate the potential of atmospheric-adaptive materials in creating high-performance, cost-effective solid oxide cells.

Main Methods:

  • Fabrication of a self-transforming cell using atmospheric-adaptive perovskite Pr0.5Ba0.5Mn0.85Co0.15O3-δ (PBMCo) electrodes.
  • Testing of the cell's performance in fuel cell mode at 800°C, evaluating power density and long-term stability.
  • Assessment of the cell's performance in electrolysis mode with varying steam concentrations (3-10 vol.% H2O) at 800°C.
  • Conducting reversible cycling tests to evaluate performance under alternating fuel cell and electrolysis conditions.

Main Results:

  • The PBMCo electrodes transformed into layered perovskite and metal in fuel atmosphere, retaining structure in air.
  • Exceptional fuel cell performance achieved: 1.10 W/cm2 at 800°C with 100-hour stability without a catalyst.
  • Electrolysis mode showed moderate current densities: -0.42 A/cm2 (3 vol.% H2O) and -0.62 A/cm2 (10 vol.% H2O) at 1.3 V and 800°C.
  • Reversible cycling demonstrated stable voltages for 30 hours at ±0.2 A/cm2 under 10 vol.% H2O.

Conclusions:

  • The self-transforming cell design effectively utilizes atmospheric-adaptive PBMCo for high-performance, reversible solid oxide cell operation.
  • This approach overcomes the performance limitations of traditional symmetrical SOCs while simplifying fabrication.
  • The demonstrated stability and efficiency highlight the potential of self-transforming cells for future energy applications.