Unravelling the dependence of hydrogen oxidation kinetics on the size of Pt nanoparticles by in operando nanoplasmonic temperature sensing

Kristina Wettergren, Anders Hellman, Filippo Carlo Cavalca, Vladimir P. Zhdanov, Christoph Langhammer

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    We use a noninvasive nanoscale optical-temperature measurement method based on localized surface plasmon resonance to investigate the particle size-dependence of the hydrogen oxidation reaction kinetics on model supported Pt nanocatalysts at atmospheric pressure in operando. With decreasing average nanoparticle size from 11 down to 3 nm, the apparent reaction activation energy is found to increase from 0.5 up to 0.8 eV. This effect is attributed to an increase of the fraction of (100)-facet and edge and corner sites and their increasingly important role in the reaction with decreasing particle size.
    Original languageEnglish
    JournalNano letters
    Volume15
    Issue number1
    Pages (from-to)574-580
    ISSN1530-6984
    DOIs
    Publication statusPublished - 2015

    Keywords

    • hydrogen oxidation
    • Indirect nanoplasmonic sensing
    • kinetics
    • particle size dependence
    • platinum
    • Activation energy
    • Atmospheric pressure
    • Enzyme kinetics
    • Hydrogen
    • Kinetics
    • Nanoparticles
    • Oxidation
    • Particle size
    • Platinum
    • Surface plasmon resonance
    • Temperature measurement
    • Hydrogen oxidation
    • Hydrogen oxidation reaction
    • Localized surface plasmon resonance
    • Nanoparticle sizes
    • Particle size dependence
    • Temperature measurement methods
    • Temperature sensing
    • Reaction kinetics

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