Probing Spatially-Resolved Pt Distribution in PtRu Nanoparticles with 195Pt EC-NMR

J. Am. Chem. Soc., 129 (45), 13806 -13807, 2007. 10.1021/ja076048v S0002-7863(07)06048-9
Web Release Date: October 19, 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*

Department of Chemistry, Georgetown University, 37th and O Streets NW, Washington, District of Columbia 20057, and School of Chemical & Biological Engineering, Seoul National University, Seoul 151-744, South Korea

yyt@georgetown.edu

Received August 11, 2007

Abstract:

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.

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