Related Experiment Video
Updated: Mar 7, 2026
06:44
Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
Published on: June 9, 2023
3.9K
Decoupling Structural Stability and Oxygen Mobility in Perovskites via A-Site Cation Engineering
Tao Long1,2,3,4, Guanghuan Li4, Da Song5,6
1College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China.
ACS Applied Materials & Interfaces
|March 5, 2026
Summary
Corner-sharing perovskite structures, like CaMnO3, offer superior stability and oxygen mobility for chemical looping. This design principle enhances oxygen carrier performance and durability in ethane oxidative dehydrogenation.
Area of Science:
- Materials Science
- Catalysis
- Chemical Engineering
Background:
- Perovskite oxygen carriers are crucial for chemical looping, but their design is limited by structural stability and oxygen mobility.
- Existing strategies focus on compositional tuning, neglecting the atomic-scale structural origins of these properties.
Purpose of the Study:
- To decouple structural stability and oxygen mobility in perovskite oxygen carriers by investigating their atomic-scale structural origins.
- To establish a new design principle for next-generation, high-durability oxygen carriers based on octahedral connectivity.
Main Methods:
- Employed AMnO3 (A = Ca, Sr, Ba) as a model system.
- Utilized atomic-resolution AC-HAADF-STEM imaging to analyze MnO6 octahedra connectivity.
- Investigated redox reversibility, specific free volume (SFV), O 2p-band center, and oxygen vacancy formation energy.
Main Results:
- CaMnO3 exhibits a stable, corner-shared octahedra network, unlike the less stable face-sharing configurations in SrMnO3 and BaMnO3.
- The corner-sharing structure in CaMnO3 facilitates fast oxygen transport and reversible phase transitions.
- CaMnO3 demonstrated excellent performance in ethane oxidative dehydrogenation, achieving 85% C2H4 selectivity and 46% yield over 20 cycles.
Conclusions:
- Established 'corner-sharing for stability' as a key design principle for perovskite oxygen carriers.
- Demonstrated that engineering octahedral connectivity, not just composition, is vital for developing durable and efficient oxygen carriers.
- CaMnO3 serves as a model for next-generation oxygen carriers with enhanced stability and activity.
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