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Plasma-Sprayed High-Performance (Bi2O3)0.75(Y2O3)0.25 Electrolyte for Intermediate-Temperature Solid Oxide Fuel Cells

Rui Chen1, Shan-Lin Zhang1, Chang-Jiu Li1

  • 1State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049 Shaanxi People's Republic of China.

Journal of Thermal Spray Technology
|April 16, 2024
PubMed
Summary
This summary is machine-generated.

Plasma spraying enables the deposition of high-performance bismuth oxide electrolytes for intermediate-temperature solid oxide fuel cells (IT-SOFCs). This method yields dense, stable electrolytes with excellent ionic conductivity, comparable to traditional bulk materials.

Keywords:
IT-SOFCYSB electrolyteconductivityplasma spraying

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Ceramics Engineering

Background:

  • Rare earth element-doped bismuth oxides (δ-Bi2O3) show high oxygen ion conductivity, making them suitable for intermediate-temperature solid oxide fuel cells (IT-SOFCs).
  • Traditional co-sintering is unsuitable for low melting point Bi2O3-based electrolytes, necessitating alternative fabrication methods for IT-SOFCs.

Purpose of the Study:

  • To investigate the feasibility of using plasma spraying for depositing high-performance Bi2O3-based electrolytes without subsequent high-temperature processing.
  • To examine the impact of deposition temperature on the microstructure, crystalline stability, and ionic conductivity of plasma-sprayed bismuth oxide electrolytes.

Main Methods:

  • Preparation of (Bi2O3)0.75(Y2O3)0.25 (YSB) spray powders using the sinter-crushing method.
  • Fabrication of YSB electrolytes via plasma spraying at varying deposition temperatures.
  • Characterization of coating microstructure, crystalline phases, and ionic conductivity.

Main Results:

  • Plasma-sprayed YSB electrolytes exhibited a dense microstructure with well-bonded lamellar interfaces.
  • A pure δ-phase YSB electrolyte was successfully deposited using 37.5-75 μm powders at a deposition temperature of 350 °C.
  • The deposited YSB electrolyte achieved an ionic conductivity of 0.19 S cm⁻¹ at 700 °C, closely matching the 0.21 S cm⁻¹ of sintered bulk material.

Conclusions:

  • Plasma spraying is a viable technique for fabricating high-performance Bi2O3-based electrolytes for IT-SOFCs.
  • The deposition temperature significantly influences the properties of the plasma-sprayed YSB electrolytes.
  • The developed plasma-sprayed electrolytes offer comparable ionic conductivity to traditional bulk materials, paving the way for efficient IT-SOFC manufacturing.