New Insights into the Strain Coupling to Surface Chemistry, Electronic Structure, and Reactivity of La0.7Sr0.3MnO3
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- Title
- New Insights into the Strain Coupling to Surface Chemistry, Electronic Structure, and Reactivity of La0.7Sr0.3MnO3
- Authors
- Jalili, Helia; HAN, JEONG WOO; Kuru, Yener; Cai, Zhuhua; Yildiz, Bilge
- Date Issued
- 2011-04-07
- Publisher
- American Chemical Society
- Abstract
- Effects of strain on the surface cation chemistry and the electronic structure are important to understand and control for attaining fast oxygen reduction kinetics on transition-metal oxides. Here we demonstrate and mechanistically interpret the strain coupling to Sr segregation, oxygen vacancy formation, and electronic structure on the surface of La0.7Sr0.3MnO3 (LSM) thin films as a model system. Our experimental results from X-ray photoelectron spectroscopy and scanning tunneling spectroscopy are discussed in light of our first principles-based simulations. A stronger Sr enrichment tendency and a more facile oxygen vacancy formation prevail for the tensile-strained LSM surface. At 500 degrees C in 10(-3) mbar oxygen, both LSM film surfaces exhibit a metallic-like tunneling conductance, with a higher density of electronic states near the Fermi level on the tensile-strained LSM surface, contrary to the behavior at room temperature. Our findings illustrate the potential role and mechanism of lattice strain in tuning the reactivity of perovskite transition-metal oxides with oxygen in solid oxide fuel cell cathodes.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/107520
- DOI
- 10.1021/jz200160b
- ISSN
- 1948-7185
- Article Type
- Article
- Citation
- Journal of Physical Chemistry Letters, vol. 2, no. 7, page. 801 - 807, 2011-04-07
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