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.
Revised: June 17, 2014 |
Published: April 24, 2014
Citation
Xin H., S. Alayoglu, R. Tao, A. Genc, C.M. Wang, L. Kovarik, and E.A. Stach, et al. 2014.Revealing the Atomic Restructuring of Pt-Co Nanoparticles.Nano Letters 14, no. 6:3203-3207.PNNL-SA-102970.doi:10.1021/nl500553a