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Tailoring Ion Ordering in Perovskite Oxide for High-Temperature Oxygen Evolution Reaction
Qingxue Liu1,2, Feiran Shen3,4, Guohui Song1,5
1State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China.
Angewandte Chemie (International Ed. in English)
|June 7, 2023
Summary
Tailoring ion ordering in PrBaCo2-x Fex O5+δ perovskites significantly impacts oxygen evolution reaction (OER) performance in solid oxide electrolysis cells (SOECs). A-site cation ordering enhances OER, while oxygen vacancy ordering hinders it, leading to optimized anode materials.
Area of Science:
- Materials Science
- Electrochemistry
- Solid Oxide Electrolysis Cells (SOECs)
Background:
- Perovskites are promising anode materials for high-temperature oxygen evolution reactions (OER) in solid oxide electrolysis cells (SOECs).
- The influence of ion ordering on the OER performance of perovskite anodes remains underexplored, hindering rational material design.
Purpose of the Study:
- To investigate the relationship between ion ordering and OER performance in PrBaCo2-x Fex O5+δ perovskites.
- To identify optimal ion ordering configurations for enhanced anode activity in SOECs.
Main Methods:
- Synthesis of PrBaCo2-x Fex O5+δ perovskites with controlled ion ordering.
- Physicochemical characterizations (e.g., XRD, TEM, XPS).
- Electrochemical testing for OER performance in SOECs.
- Density functional theory (DFT) calculations to understand ion migration mechanisms.
Main Results:
- A-site cation ordering was found to promote oxygen bulk migration and surface transport, enhancing OER activity.
- Oxygen vacancy ordering was observed to weaken OER performance.
- The PrBaCo2 O5+δ anode with A-site ordering and disordered oxygen vacancies achieved a peak performance of 3.40 A cm⁻² at 800°C and 2.0 V.
Conclusions:
- Ion ordering, specifically A-site cation ordering, is a critical factor in determining the high-temperature OER performance of perovskite anodes for SOECs.
- Understanding and controlling ion ordering provides a pathway for designing superior anode materials for efficient SOEC operation.
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