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The in-situ generation of eutectic carbonate in carbonate-superstructured solid fuel cells (CSSFCs) significantly boosts ionic conductivity. This enhances CSSFC power density, making them more efficient for methane fuel applications.

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Area of Science:

Materials Science
Electrochemistry
Energy Conversion

Background:

Carbonate-superstructured solid fuel cells (CSSFCs) offer excellent performance, low cost, and ease of fabrication.
Optimizing ionic conductivity in solid electrolytes is crucial for enhancing fuel cell efficiency.

Purpose of the Study:

To demonstrate the critical role of in-situ generated eutectic carbonate phase in CSSFC performance.
To investigate the impact of eutectic Li2CO3/Na2CO3 on the ionic conductivity of Ce0.8Sm0.2O1.9 solid electrolyte.
To evaluate the resulting enhancement in CSSFC power density using methane fuel.

Main Methods:

Fabrication of CSSFCs with a Ce0.8Sm0.2O1.9 solid electrolyte.
In-situ generation of a eutectic Li2CO3/Na2CO3 phase within the CSSFC structure.
Measurement of oxygen ionic conductivity of the modified solid electrolyte.
Performance testing of CSSFCs using methane fuel at 550 °C to determine peak power density.

Main Results:

The in-situ generated eutectic carbonate phase increased the oxygen ionic conductivity of Ce0.8Sm0.2O1.9 by 20 times (from 3.5 × 10^-3 to 7.3 × 10^-2 S cm^-1).
This significant improvement in ionic conductivity led to a 6-fold enhancement in CSSFC peak power density, reaching up to 206 mW cm^-2 with methane fuel at 550 °C.

Conclusions:

The in-situ generation of a eutectic carbonate phase is a key factor for achieving high performance in CSSFCs.
This finding provides a critical pathway for designing more efficient and cost-effective CSSFCs for clean energy applications.
The enhanced ionic conductivity of the solid electrolyte directly translates to improved fuel cell power output.