Stability of Porous Platinum Nanoparticles: Combined In Situ TEM and Theoretical Study

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

    Research output: Contribution to journalJournal articleResearchpeer-review

    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
    JournalThe Journal of Physical Chemistry Letters
    Volume3
    Issue number9
    Pages (from-to)1106-1110
    ISSN1948-7185
    DOIs
    Publication statusPublished - 2012

    Keywords

    • Porous particles
    • In situ TEM
    • First-principles calculations
    • Thermal stability

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