Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 138, Issue 8, Pages 2488-2491Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.5b11713
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Funding
- U.S. Department of Energy (DOE)
- Office of Science (OS)
- Basic Energy Sciences (BES)
- Materials Science and Engineering Division (synthesis, physical property characterization, and XAS data analysis
- Laboratory Directed Research and Development Program of Oak Ridge National Laboratory
- Scientific User Facilities Division, BES
- Fluid Interface Reactions, Structures, and Transport (FIRST) Center, an Energy Frontier Research Center - U.S. DOE, OS, BES [06CH113.57]
- BES
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Strain is known to greatly influence low temperature oxygen electro catalysis on noble metal films, leading to significant enhancements in bifunctional activity essential for fuel cells and Metal-air batteries. However, its catalytic impact on transition-metal oxide thin films, such as perovskites, is not widely understood. Here, we epitaxially strain the conducting perovskite LaNiO3 to systematically determine its influence on both the oxygen reduction and oxygen evolution reaction. Uniquely, we found that compressive strain could significantly enhance both reactions, yielding a bifunctional catalyst that surpasses the performance of noble metals' such as Pt. We attribute the improved bifunctionality to strain induced splitting of the e(g) Orbitals, which can customize orbital asymmetry at the surface. Analogous to strain induced shifts in the d-band center of noble metals relative to the Fermi level, :such splitting can dramatically affect catalytic activity in this perovskite and other potentially more active Oxides.
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