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Stabilizing nanostructured solid oxide fuel cell cathode with atomic layer deposition.

Yunhui Gong1, Diego Palacio, Xueyan Song

  • 1Department of Mechanical Engineering, University of South Carolina , Columbia, South Carolina 29201, United States.

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|August 9, 2013
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Summary
This summary is machine-generated.

Atomic layer deposition of nanoscale ZrO2 films enhances the stability and oxygen reduction reaction activity of La0.6Sr0.4CoO3-δ (LSCo) solid oxide fuel cell cathodes. This breakthrough enables long-term operation at 700 °C.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Conversion

Background:

  • La0.6Sr0.4CoO3-δ (LSCo) is a highly active cathode material for intermediate-temperature solid oxide fuel cells (IT-SOFCs).
  • LSCo suffers from instability and degradation at elevated temperatures, limiting its practical application.
  • Nanostructured cathodes offer high surface area but can exacerbate stability issues.

Purpose of the Study:

  • To enhance the long-term operational stability of nanostructured LSCo cathodes.
  • To maintain high oxygen reduction reaction (ORR) activity in LSCo cathodes under demanding conditions.
  • To investigate the role of nanoscale surface coatings in improving cathode performance.

Main Methods:

  • Atomic Layer Deposition (ALD) was used to apply conformal nanoscale ZrO2 overcoats onto LSCo surfaces.
  • Electrochemical impedance spectroscopy (EIS) was employed to evaluate polarization area-specific resistance (ASR).
  • Long-term stability tests were conducted at 700 °C for 4000 hours.

Main Results:

  • The ALD-ZrO2 overcoated LSCo cathode demonstrated exceptional stability, retaining high ORR activity for 4000 hours at 700 °C.
  • A significant reduction in polarization area-specific resistance (factor of 19) and degradation rate (factor of 18) was observed compared to pristine LSCo.
  • The ZrO2 overcoat provided multifunctionality, including porosity for oxygen access, ionic and electronic conductivity, confinement of nanoparticle growth, and suppression of strontium segregation.

Conclusions:

  • Nanoscale ALD-ZrO2 overcoats are highly effective in stabilizing nanostructured LSCo IT-SOFC cathodes.
  • The observed improvements are attributed to the unique properties of the ALD-derived ZrO2 layer.
  • This approach offers a promising strategy for developing durable and high-performance SOFCs.