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High-performing and stable semiconductor yttrium-doped gadolinium electrolyte for low-temperature solid oxide fuel
Junjiao Li1, Muhammad Yousaf2, Muhammad Akbar3
1Department of Electronic and Engineering, Nanjing Vocational Institute of Mechatronic Technology, Nanjing 211306, P. R. China.
Chemical Communications (Cambridge, England)
|May 2, 2023
Summary
A new Yttrium-doped Gadolinium oxide (YDG) material shows excellent performance as an electrolyte for low-temperature solid oxide fuel cells (LT-SOFCs), offering high ionic conductivity and stability at reduced temperatures.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Conversion
Background:
- Developing high-performance electrolytes is crucial for advancing low-temperature solid oxide fuel cells (LT-SOFCs).
- Existing electrolytes often face limitations at reduced operating temperatures, hindering SOFC efficiency and applicability.
Purpose of the Study:
- To introduce and evaluate a novel Yttrium-doped Gadolinium oxide (YDG) material as a potential electrolyte for LT-SOFCs.
- To characterize the material properties and assess its performance in LT-SOFC applications.
Main Methods:
- Synthesis and characterization of Yttrium-doped Gadolinium oxide (YDG).
- Performance testing of YDG as an electrolyte in LT-SOFCs, including power density and ionic conductivity measurements.
- Electrochemical impedance spectroscopy (EIS) to analyze ohmic resistance.
- Long-term stability testing.
- Density Functional Theory (DFT) calculations for electronic band structure analysis.
Main Results:
- YDG demonstrated a high power density of 1046 mW cm⁻² at 550 °C.
- Achieved high ionic conductivity of 0.19 S cm⁻¹.
- Exhibited minimal ohmic resistance (0.06–0.09 Ω cm²) across a temperature range of 460–550 °C.
- Showcased stable operation for 60 hours, indicating good chemical stability at reduced temperatures.
Conclusions:
- YDG is a promising high-performance electrolyte material for low-temperature solid oxide fuel cells.
- The material's properties, including high ionic conductivity and stability, make it suitable for efficient energy conversion at lower operating temperatures.
