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Lattice Strain Mapping of Platinum Nanoparticles on Carbon and SnO2 Supports

Lattice Strain Mapping of Platinum Nanoparticles on Carbon and SnO2 Supports

Takeshi Daio, Aleksandar Staykov, Limin Guo, Jianfeng Liu, Masaki Tanaka, Stephen Matthew Lyth, Kazunari Sasaki

Sci Rep. 2015 Aug 18;5:13126.

PMID: 26283473

Abstract:

It is extremely important to understand the properties of supported metal nanoparticles at the atomic scale. In particular, visualizing the interaction between nanoparticle and support, as well as the strain distribution within the particle is highly desirable. Lattice strain can affect catalytic activity, and therefore strain engineering via e.g. synthesis of core-shell nanoparticles or compositional segregation has been intensively studied. However, substrate-induced lattice strain has yet to be visualized directly. In this study, platinum nanoparticles decorated on graphitized carbon or tin oxide supports are investigated using spherical aberration-corrected scanning transmission electron microscopy (Cs-corrected STEM) coupled with geometric phase analysis (GPA). Local changes in lattice parameter are observed within the Pt nanoparticles and the strain distribution is mapped. This reveals that Pt nanoparticles on SnO2 are more highly strained than on carbon, especially in the region of atomic steps in the SnO2 lattice. These substrate-induced strain effects are also reproduced in density functional theory simulations, and related to catalytic oxygen reduction reaction activity. This study suggests that tailoring the catalytic activity of electrocatalyst nanoparticles via the strong metal-support interaction (SMSI) is possible. This technique also provides an experimental platform for improving our understanding of nanoparticles at the atomic scale.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
LS72337	Platinum on graphitized carbon			Price

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