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

Lan-Yun Chang, Amanda Susan Barnard, Christian Dwyer, Thomas W Hansen, Jakob B Wagner, Rafal Edward Dunin-Borkowski, Matthew Weyland, Hiromi Konishi, Huifang Xu

Research output: Contribution to journalArticleResearchpeer-review

10 Citations (Scopus)

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
Pages (from-to)1106 - 1110
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume3
Issue number9
DOIs
Publication statusPublished - 2012

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