Revealing the Atomic Restructuring of Pt–Co Nanoparticles
Nano Letters2014Vol. 14(6), pp. 3203–3207
Citations Over TimeTop 10% of 2014 papers
Huolin 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
Abstract
We 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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