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MgO-MgAl2O4-Supported Flat-Tubular Segmented-In-Series SOFCs Featuring Ultra-High Conductivity Interlayer for

Yanan Li1, Xiang-Xiang Pan2, Hui-Yu Zhang1

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

ACS Applied Materials & Interfaces
|January 31, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel NiO-MgAl2O4 interlayer for solid oxide fuel cells (SOFCs). This interlayer enhances performance and stability in ceramic-supported SOFCs, crucial for efficient energy conversion.

Keywords:
MgO-MgAl2O4NiO-MgAl2O4 interlayerinterface reactioninterlayer optimizationsolid oxide fuel cells

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Conversion

Background:

  • High-performance solid oxide fuel cells (SOFCs) require advanced interlayers for improved conductivity and interfacial compatibility.
  • Ceramic-supported SOFCs, particularly flat-tubular segmented-in-series designs, face challenges with interlayer stability and diffusion.

Purpose of the Study:

  • To develop a highly conductive and compatible interlayer for MgO-MgAl2O4 (MMA)-supported SOFCs.
  • To enhance the performance and long-term stability of inert ceramic-supported SOFCs.

Main Methods:

  • Fabrication of a 70 vol % NiO-30 vol % MgAl2O4 interlayer using a cosintering process.
  • Characterization of interlayer conductivity, interfacial compatibility, and diffusion suppression.
  • Testing of single-cell and 16-cell flat-tubular segmented-in-series SOFC performance at 850 °C.

Main Results:

  • The NiO-MgAl2O4 interlayer effectively suppressed MgO diffusion from the MMA substrate to 25 μm.
  • Interlayer conductivity exceeded 3400 S cm-1 at operational temperatures.
  • A single cell achieved an open circuit voltage (OCV) of 1.07 V and a power density of 760 mW cm-2, with excellent stability.
  • A 16-cell FT-SIS-SOFC stack demonstrated an OCV of 17 V and a maximum output power of 15 W at 850 °C.

Conclusions:

  • The developed NiO-MgAl2O4 interlayer is highly conductive and compatible, significantly improving SOFC performance.
  • This interlayer technology is critical for advancing inert ceramic-supported FT-SIS-SOFCs.
  • The results demonstrate a viable pathway for high-performance, stable solid oxide fuel cell systems.