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Fe-based double perovskite with Zn doping for enhanced electrochemical performance as intermediate-temperature solid
Liang-Mei Xue1, Song-Bo Li1, Sheng-Li An2
1School of Chemistry and Chemical Engineering, Inner Mongolia University of Science & Technology Baotou 014010 China songboli2021@hotmail.com.
RSC Advances
|October 20, 2023
Summary
This study explores zinc doping in LaBaFe2O5+ ceramics for improved solid oxide fuel cell performance. Zinc doping enhances oxygen vacancies and conductivity, leading to reduced resistance and higher power density.
Area of Science:
- Materials Science
- Electrochemistry
- Solid Oxide Fuel Cells (SOFCs)
Background:
- LaBaFe2O5+ is a promising material for SOFCs.
- Optimizing its properties through doping is crucial for enhancing performance.
- Transition metal doping, specifically with Zn2+, is investigated for its effects.
Purpose of the Study:
- To investigate the impact of B-site Zn doping on LaBaFe2O5+.
- To evaluate changes in crystal structure, thermal expansion, and electrochemical properties.
- To assess the material's suitability as a cathode for SOFCs.
Main Methods:
- Synthesis of LaBaFe2-xZnxO5+ (x = 0-0.2) ceramics.
- Characterization using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM).
- Electrochemical performance testing including conductivity, impedance spectroscopy, and power density measurements.
Main Results:
- Zn doping increased unit cell volume and lattice expansion without altering crystal structure.
- Increased oxygen vacancy concentration and Fe4+ content were observed with higher doping levels.
- Optimized conductivity (103 S cm-1) and reduced polarization resistance (0.014 Ω cm2) were achieved, with a peak power density of 453 mW cm-2.
Conclusions:
- Zn doping effectively modifies the properties of LaBaFe2O5+ for SOFC applications.
- The optimized material exhibits enhanced electrochemical activity and thermal stability.
- LaBaFe1.8Zn0.2O5+ shows significant potential as an efficient cathode material for SOFCs.
