Stability of porous platinum nanoparticles: Combined in situ TEM and theoretical study

Shery L.Y. Chang, Amanda S. Barnard, Christian Dwyer, Thomas W. Hansen, Jakob B. Wagner, Rafal E. Dunin-Borkowski, Matthew Weyland, Hiromi Konishi, Huifang Xu

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Porous platinum nanoparticles provide a route for the development of catalysts that use less platinum without sacrificing catalytic performance. Here, we examine porous platinum nanoparticles using a combination of in situ transmission electron microscopy and calculations based on a first-principles-parametrized thermodynamic model. Our experimental observations show that the initially irregular morphologies of the as-sythesized porous nanoparticles undergo changes at high temperatures to morphologies having faceted external surfaces with voids present in the interior of the particles. The increasing size of stable voids with increasing temperature, as predicted by the theoretical calculations, shows excellent agreement with the experimental findings. The results indicate that hollow-structured nanoparticles with an appropriate void-to-total-volume ratio can be stable at high temperatures.

Original languageEnglish (US)
Pages (from-to)1106-1110
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume3
Issue number9
DOIs
StatePublished - May 3 2012
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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