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Enhanced Bifunctional Oxygen Catalysis in Strained LaNiO3 Perovskites
Jonathan R Petrie, Valentino R Cooper, John W Freeland1
1Advanced Photon Source, Argonne National Laboratory , Argonne, Illinois 60439, United States.
Journal of the American Chemical Society
|February 12, 2016
Summary
Compressive strain significantly enhances oxygen electrocatalysis in perovskite oxide thin films, boosting bifunctional activity for fuel cells and batteries beyond noble metal performance.
Area of Science:
- Materials Science
- Electrochemistry
- Surface Science
Background:
- Strain engineering is crucial for optimizing low-temperature oxygen electrocatalysis on noble metal films.
- The catalytic effect of strain on transition-metal oxide thin films, like perovskites, remains poorly understood.
Purpose of the Study:
- To systematically investigate the influence of epitaxial strain on the oxygen reduction and oxygen evolution reactions in the conducting perovskite LaNiO3.
- To understand the mechanism behind strain-induced catalytic enhancements in perovskite oxides.
Main Methods:
- Epitaxial straining of LaNiO3 thin films.
- Electrocatalytic performance testing for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER).
- Analysis of strain effects on electronic structure, specifically eg orbital splitting.
Main Results:
- Compressive strain significantly enhanced both ORR and OER bifunctional activity in LaNiO3.
- The strained perovskite catalyst outperformed noble metal catalysts like Platinum (Pt).
- Strain-induced eg orbital splitting was identified as the key factor, customizing surface orbital asymmetry.
Conclusions:
- Epitaxial strain is a powerful tool for tuning the electrocatalytic activity of perovskite oxides.
- Strain-engineered LaNiO3 demonstrates superior bifunctional performance for oxygen electrocatalysis.
- The findings provide insights into designing advanced oxide catalysts by manipulating electronic structure through strain.
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