Journal
NANO LETTERS
Volume 14, Issue 6, Pages 3203-3207Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl500553a
Keywords
Catalysis; environmental TEM; in situ TEM; strain mapping; atomic-resolution TEM
Categories
Funding
- U.S. Department of Energy (DOE) Office of Biological and Environmental Research
- DOE [DE-AC05-76RLO1830]
- DOE Office of Basic Sciences (BES) [DE-AC02-98CH10886]
- DOE BES [DE-AC02-05CH11231]
- SERC at LBNL
- Chemical Imaging Initiative at PNNL under Laboratory Directed Research and Development Program at PNNL
- Office of Basic Energy Sciences, Chemical Science Division of the U.S. DOE [DE-AC02-05CH11231]
- H.Z.'s Early Career Research Program under DOE Office of Science
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We studied Pt-Co bimetallic nanoparticles during oxidation in O-2 and reduction in H-2 atmospheres using an aberration corrected environmental transmission electron microscope. During oxidation Co migrates to the nanoparticle surface forming a strained epitaxial CoO film. It subsequently forms islands via strain relaxation. The atomic restructuring is captured as a function of time. During reduction cobalt migrates back to the bulk, leaving a monolayer of platinum on the surface.
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