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

Kristina Wettergren; Anders Hellman; Filippo Cavalca; Vladimir P Zhdanov; Christoph Langhammer

doi:10.1021/nl504042u

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

Nano Lett. 2015 Jan 14;15(1):574-80. doi: 10.1021/nl504042u. Epub 2014 Dec 11.

Authors

Kristina Wettergren¹, Anders Hellman, Filippo Cavalca, Vladimir P Zhdanov, Christoph Langhammer

Affiliation

¹ Department of Applied Physics and ‡Competence Centre for Catalysis, Chalmers University of Technology , 41296 Göteborg, Sweden.

PMID: 25479190
DOI: 10.1021/nl504042u

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.

Keywords: Indirect nanoplasmonic sensing; hydrogen oxidation; kinetics; particle size dependence; platinum.

Publication types

Research Support, Non-U.S. Gov't