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Fe-Doped Ceria-Based Ceramic Cathode for High-Efficiency CO2 Electrolysis in Solid Oxide Electrolysis Cell
Lijie Zhang1, Yunan Jiang1,2, Kang Zhu1
1CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui, 230026, China.
Small Methods
|February 12, 2024
Summary
Pure ceramic electrodes incorporating iron into ceria show promise for solid oxide electrolysis cells (SOEC). These Fe-SDC materials enhance CO2 conversion into valuable chemicals and fuels, boosting SOEC performance.
Area of Science:
- Materials Science
- Electrochemistry
- Sustainable Energy
Background:
- Solid oxide electrolysis cells (SOEC) are crucial for converting CO2 into fuels and chemicals.
- Developing efficient and stable electrodes is key to advancing SOEC technology.
- Ceria-based materials are promising candidates for SOEC electrodes, but require optimization.
Purpose of the Study:
- To investigate the performance of Sr-free, iron-doped ceria (Fe-SDC) as fuel electrodes in SOEC.
- To understand the role of iron incorporation on the material's properties and catalytic activity for CO2 reduction.
- To evaluate the electrochemical performance of Fe-SDC electrodes in SOEC devices.
Main Methods:
- Synthesis of pure ceramic FexSm0.2Ce0.8O2-δ (xFe-SDC) electrodes with varying iron content (x ≤ 0.05).
- Characterization of electrode properties, including oxygen vacancy concentration and catalytic site formation.
- Density functional theory (DFT) calculations to model the effect of iron on CO2 reduction reaction (CO2RR) energy barriers and oxygen ion diffusion.
- Electrochemical testing of single SOEC cells with xFe-SDC cathodes at 800 °C and 1.5 V.
Main Results:
- Successfully constructed Sr-free ceria-based electrodes with iron incorporation (x ≤ 0.05).
- Iron doping increased oxygen vacancy concentration and promoted catalytic sites for CO2RR.
- DFT calculations confirmed that iron enhances electrochemical performance by lowering the CO2RR energy barrier and improving oxygen ion diffusion.
- Single cells with 0.05Fe-SDC cathodes achieved high current densities of -1.98 A cm⁻² (50% CO2/CO) and -2.26 A cm⁻² (pure CO2) at 800 °C.
Conclusions:
- Iron-doped ceria (xFe-SDC) electrodes demonstrate significant potential for high-performance SOEC applications.
- The optimized Fe-SDC material offers an effective pathway for efficient CO2 conversion.
- These findings pave the way for advanced fuel electrodes in sustainable energy technologies.
