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Readily processed protonic ceramic fuel cells with high performance at low temperatures.

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Protonic ceramic fuel cells (PCFCs) can now operate at lower temperatures (350–550°C) thanks to new fabrication methods and a novel cathode material, achieving high power densities on hydrogen and methane fuels.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Conversion

Background:

  • Protonic ceramic fuel cells (PCFCs) offer lower-temperature operation than solid oxide fuel cells (SOFCs) due to higher proton conductivity.
  • Challenges in PCFC fabrication and cathode development have limited their widespread adoption.

Purpose of the Study:

  • To develop a simplified fabrication process for PCFCs.
  • To create a novel cathode material for enhanced performance at intermediate temperatures.
  • To demonstrate the long-term stability and efficiency of the developed PCFCs.

Main Methods:

  • Fabrication of PCFCs using sintering agents for a single moderate-temperature processing step.
  • Development of a multifunctional cathode material: BaCo(0.4)Fe(0.4)Zr(0.1)Y(0.1)O(3-δ) (BCFZY0.1).
  • Testing of PCFC button cells on H2 and CH4 fuels at temperatures ranging from 350°C to 500°C.

Main Results:

  • Successful fabrication of PCFCs with a simplified, moderate-temperature process.
  • Achieved high power densities: 455 mW/cm² on H2 and 142 mW/cm² on CH4 at 500°C.
  • Demonstrated stable operation without degradation for 1400 hours and functionality down to 350°C.

Conclusions:

  • The developed fabrication method and cathode material enable efficient and stable low-temperature operation of PCFCs.
  • These advancements pave the way for practical application of PCFCs using hydrogen and hydrocarbon fuels.
  • The study highlights the potential of PCFCs as a viable alternative for clean energy generation.