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Fe-Doped SDC Solid Solution as an Electrolyte for Low-to-Intermediate-Temperature Solid Oxide Fuel Cells.

Lijie Zhang1, Yunan Jiang1,2, Kang Zhu1

  • 1CAS Key Laboratory of Materials for Energy Conversion Department of Materials Science and Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei 230026, Anhui, China.

ACS Applied Materials & Interfaces
|January 19, 2024
PubMed
Summary
This summary is machine-generated.

Iron doping enhances samaria-doped ceria (SDC) for solid oxide fuel cells (SOFCs). This Fe-doped SDC electrolyte improves sinterability, conductivity, and single-cell performance at low temperatures.

Keywords:
Fe-doped ceriaintermediate-temperature SOFClow-temperature SOFCsamaria-doped ceriasolid solution

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Conversion

Background:

  • Samaria-doped ceria (SDC) is a promising electrolyte for low-to-intermediate-temperature solid oxide fuel cells (SOFCs).
  • Improving the sinterability and ionic conductivity of SDC is crucial for enhancing SOFC performance.
  • Iron (Fe) is explored as a potential sintering aid and dopant to modify SDC properties.

Purpose of the Study:

  • To investigate the solubility and effects of iron doping in SDC.
  • To evaluate the impact of Fe doping on the sintering characteristics, thermal expansion, and electrical conductivity of SDC electrolytes.
  • To assess the performance of Fe-doped SDC as an electrolyte in single SOFC devices.

Main Methods:

  • Synthesis of Fe-doped SDC solid solutions.
  • Characterization of material properties including solubility, sintering behavior, thermal expansion, and electrical conductivity.
  • Fabrication and testing of single SOFCs utilizing Fe-doped SDC electrolytes.

Main Results:

  • Fe was found to be soluble in SDC, forming a solid solution whose solubility depends on sintering temperature.
  • Fe doping significantly improved electrolyte properties, including enhanced sintering, modified thermal expansion, and increased electrical conductivity.
  • Electrical conductivity increased while activation energy decreased with Fe doping.
  • Single cells with Fe-doped SDC electrolytes exhibited a 52.8% increase in peak power density to 0.726 W cm⁻² at 600 °C.
  • Stable operation for 150 hours at 600 °C and 0.3 A cm⁻² was demonstrated.

Conclusions:

  • Fe-doped SDC forms a promising solid solution electrolyte for low-to-intermediate-temperature SOFCs.
  • Fe doping effectively enhances key electrolyte properties and improves SOFC performance.
  • The demonstrated stable operation highlights the potential of Fe-doped SDC for practical SOFC applications.