J. Am. Chem. Soc., 129 (45), 13806 -13807, 2007.
Probing Spatially-Resolved Pt Distribution in PtRu Nanoparticles with 195Pt EC-NMR
Aaron L. Danberry, Bingchen Du, In-Su Park, Yung-Eun Sung, and YuYe Tong*
We report the first quantitative analysis of spatially resolved local Pt distribution in graphite and carbon nanofibers supported PtRu alloy nanoparticles using slow-beat measurements by in situ 195Pt electrochemical NMR. While the two samples had the same nominal 1:1 atomic ratio and similar average particle size, it was found that the former had a rather homogeneous Pt distribution but not the latter, which had Pt segregation at the core and depletion at the surface of the nanoparticles.