Revealing the Atomic Restructuring of Pt–Co Nanoparticles
2014; American Chemical Society; Volume: 14; Issue: 6 Linguagem: Inglês
10.1021/nl500553a
ISSN1530-6992
AutoresHuolin L. Xin, Selim Alayoǧlu, Runzhe Tao, Arda Genç, Chongmin Wang, Libor Kovařík, Eric A. Stach, Lin‐Wang Wang, Miquel Salmerón, Gábor A. Somorjai, Haimei Zheng,
Tópico(s)Copper-based nanomaterials and applications
ResumoWe studied Pt-Co bimetallic nanoparticles during oxidation in O2 and reduction in H2 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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