Lattice Strain Mapping of Platinum Nanoparticles on Carbon and SnO 2 Supports

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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 SnO 2 are more highly strained than on carbon, especially in the region of atomic steps in the SnO 2 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.

Original languageEnglish
Article number13126
JournalScientific Reports
Volume5
DOIs
Publication statusPublished - Aug 18 2015

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platinum
nanoparticles
carbon
strain distribution
catalytic activity
electrocatalysts
metals
tin oxides
aberration
lattice parameters
platforms
interactions
engineering
density functional theory
transmission electron microscopy
scanning electron microscopy
oxides
oxygen
synthesis
simulation

All Science Journal Classification (ASJC) codes

  • General

Cite this

Lattice Strain Mapping of Platinum Nanoparticles on Carbon and SnO 2 Supports. / Daio, Takeshi; Staykov, Aleksandar Tsekov; Guo, Limin; Liu, Jianfeng; Tanaka, Masaki; Lyth, Stephen Matthew; Sasaki, Kazunari.

In: Scientific Reports, Vol. 5, 13126, 18.08.2015.

Research output: Contribution to journalArticle

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