Unravelling the Dependence of Hydrogen Oxidation Kinetics on the Size of Pt Nanoparticles by in Operando Nanoplasmonic Temperature Sensing

作者：Wettergren Kristina; Hellman Anders; Cavalca Filippo; Zhdanov Vladimir P; Langhammer Christoph^*

来源：Nano Letters, 2015, 15(1): 574-580.

DOI：10.1021/nl504042u

• Indirect nanoplasmonic sensing
• hydrogen oxidation
• kinetics
• particle size dependence
• platinum

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.

• 出版日期2015-1