title: Unravelling the dependence of hydrogen oxidation kinetics on the size of Pt nanoparticles by in operando nanoplasmonic temperature sensing.
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.
authors.affiliation: Department of Applied Physics and ‡Competence Centre for Catalysis, Chalmers University of Technology , 41296 Göteborg, Sweden.
authors.forename: Kristina
authors.initials: K
authors.lastname: Wettergren
authors.forename: Anders
authors.initials: A
authors.lastname: Hellman
authors.forename: Filippo
authors.initials: F
authors.lastname: Cavalca
authors.forename: Vladimir P
authors.initials: VP
authors.lastname: Zhdanov
authors.forename: Christoph
authors.initials: C
authors.lastname: Langhammer
keywords: Indirect nanoplasmonic sensing; hydrogen oxidation; kinetics; particle size dependence; platinum