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Enhanced oxygen reduction activity of platinum monolayer on gold nanoparticles

Authors Shao, M. View this author's profile
Peles, A.
Shoemaker, K.
Gummalla, M.
Njoki, P.N.
Luo, J.
Zhong, C.J.
Issue Date 2011
Source The journal of physical chemistry letters , v. 2, (2), 2011, p. 67-72
Summary The increase in oxygen binding energy was previously proposed to account for the lower oxygen reduction activity of a Pt monolayer supported on Au(111) single crystal than that on Pd(111) and pure Pt(111) surfaces. This single-crystal based understanding, however, cannot explain the new finding of a 1.6-fold increase of oxygen reduction activity on Pt monolayer-modified 3-nm Au nanoparticles (Pt/Au/C) in comparison with that on Pt/Pd/C with a similar particle size. The Pt/Au/C catalyst also has an activity higher than that of a state-of-the-art 2.8-nm Pt/C catalyst. Our new experimental results and density functional theory calculations demonstrate that a significant compressive strain in the surface of the core nanoparticles plays a role in the observed activity enhancement. © 2010 American Chemical Society.
ISSN 1948-7185
Language English
Format Article
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