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Enhancing Oxygen Exchange Activity by Tailoring Perovskite Surfaces
Yuan Cheng1, Abhinav S Raman1, Julian Paige1
1Department of Chemical and Biomolecular Engineering , University of Pennsylvania , Philadelphia , Pennsylvania 19104-6315 , United States.
The Journal of Physical Chemistry Letters
|July 5, 2019
Summary
Optimizing perovskite electrocatalysts for fuel cells requires understanding surface composition. Tailoring surface termination significantly impacts oxygen reduction reaction rates, especially for LSF and LSM materials.
Area of Science:
- Materials Science
- Electrochemistry
- Surface Chemistry
Background:
- Perovskite (ABO3) oxides are crucial electrocatalysts in solid oxide fuel cell cathodes.
- Understanding surface effects is key to enhancing their electrochemical performance.
- Oxygen reduction reaction (ORR) is a critical process in fuel cell operation.
Purpose of the Study:
- Investigate how A- and B-site cation doping affects the ORR rate in perovskite oxides.
- Determine the influence of surface termination on the ORR activity of specific perovskite materials.
- Provide insights for designing high-performance perovskite electrocatalysts.
Main Methods:
- Utilized density functional theory (DFT) calculations.
- Analyzed the stability of various active sites on perovskite surfaces.
- Calculated ORR rates for different surface terminations and compositions.
Main Results:
- Surface termination significantly impacts ORR rates for Sr-doped LaFeO3 (LSF) and LaMnO3 (LSM).
- A-site terminated surfaces showed higher ORR rates for LSF and LSM.
- Surface termination had a less pronounced effect on the ORR activity of LaCoO3 (LSCo).
Conclusions:
- Surface chemical and geometric composition critically influence perovskite electrocatalyst performance.
- Tailoring surface termination is essential for optimizing the oxygen reduction reaction.
- Findings guide the rational design of advanced perovskite electrocatalysts for fuel cells.
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