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Optimizing CO2 Electrolysis Performance on Oxygen Vacancy Modulation for LaSr2-TiFeO6 Perovskite in a Solid Oxide
Xiang Wang1, Haoran Wang1, Min Li1
1Research Center of Solid Oxide Fuel Cell, China University of Mining and Technology─Beijing, Beijing 100083, China.
ACS Applied Materials & Interfaces
|March 3, 2025
Summary
Researchers improved carbon dioxide electrolysis in solid oxide electrolysis cells (SOECs) by doping LaxSr2-xTiFeO6. This enhances oxygen vacancies and CO2 adsorption, boosting fuel electrode performance for sustainable energy.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Solid oxide electrolysis cells (SOECs) require efficient and durable fuel electrodes for cost-effective carbon dioxide (CO2) electrolysis.
- LaxSr2-xTiFeO6 (LxSTF) double perovskites are investigated as potential fuel electrode materials.
Purpose of the Study:
- To enhance CO2 electrolysis performance in SOECs by modulating oxygen vacancies in LxSTF perovskites through La doping.
- To investigate the effect of La doping on the structural and electrochemical properties of LxSTF materials.
Main Methods:
- Synthesis and characterization of LxSTF perovskites (x = 0, 0.1, 0.2, 0.3).
- Oxygen vacancy concentration and CO2 adsorption capacity measurements.
- Electrochemical analysis including polarization resistance and current density measurements at 800 °C.
Main Results:
- La doping induced lattice expansion and increased surface oxygen species in the perovskite oxides.
- La0.1Sr1.9TiFeO6 (LSTF01) showed significantly improved oxygen vacancy concentration and CO2 adsorption capacity compared to pristine Sr2TiFeO6 (STF).
- LSTF01 exhibited the lowest polarization resistance (0.70 Ω·cm2) and highest peak current density (0.95 A·cm-2) at 800 °C, facilitating oxygen-ion conduction and CO2 adsorption during CO2 reduction reaction (CO2RR).
Conclusions:
- Oxygen vacancy modulation via La doping is a highly effective strategy for optimizing LxSTF fuel electrode materials for SOEC applications.
- The enhanced performance of LSTF01 demonstrates its potential for efficient and sustainable CO2 electrolysis.
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