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Proton-Conducting Amorphous Alumina Electrolytes for Low-Temperature Ceramic Fuel Cells.

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  • 1Energy Storage Joint Research Center, School of Energy & Environment, Southeast University, Nanjing, 210096, China.

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Summary

Amorphous alumina (AlOx) offers a novel electrolyte for solid oxide fuel cells (SOFCs), achieving high ionic conductivity and power density. This advancement enables lower operating temperatures for efficient energy conversion.

Keywords:
amorphous aluminadistribution of relaxation timesproton transport mechanismssolid oxide fuel cellsstructural disorder

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Conversion

Background:

  • Solid oxide fuel cells (SOFCs) require high-performance electrolytes for reduced operational temperatures.
  • Conventional electrolytes like gadolinium-doped ceria (GDC) face limitations in achieving optimal ionic transport.

Purpose of the Study:

  • To introduce amorphous alumina (AlOx) as a novel electrolyte material for SOFCs.
  • To investigate the structural characteristics and charge transport mechanisms of AlOx.
  • To compare AlOx performance against crystalline alumina and GDC.

Main Methods:

  • Comparative analysis of amorphous alumina (AlOx), crystalline alumina (α-Al2O3, γ-Al2O3), and gadolinium-doped ceria (GDC).
  • Electrochemical impedance spectroscopy (EIS) to measure ionic conductivity.
  • Distribution of relaxation times (DRT) analysis to identify conduction pathways and electrochemical sub-processes.

Main Results:

  • Amorphous alumina (AlOx) exhibits a significant enrichment of oxygen vacancy concentration.
  • AlOx demonstrates high ionic conductivity (0.08-0.12 S/cm at 480-540 °C), one order of magnitude higher than crystalline alumina.
  • Symmetrical SOFCs with AlOx electrolytes achieved a power density of 677 mW/cm² at 540 °C.
  • DRT analysis confirmed predominant protonic conduction pathways in AlOx.

Conclusions:

  • Amorphous alumina (AlOx) is a promising advanced electrolyte for low-temperature SOFCs.
  • The disordered structure of AlOx facilitates rapid ionic transport.
  • This study provides valuable insights into the potential of amorphous ceramics as electrolytes.