title: Size-dependent kinetics of hydriding and dehydriding of Pd nanoparticles.
abstract: Using a new indirect nanoplasmonic sensing method with subsecond resolution, we have studied hydriding and dehydriding kinetics of Pd nanoparticles in the size range 1.8-5.4 nm. Strong particle-size effects are observed. The scaling of the hydriding and dehydriding time scales satisfies power and power-exponential laws. The former (with an exponent of 2.9) is in perfect agreement with Monte Carlo simulations of diffusion-controlled hydriding kinetics. The latter is explained by the effect of surface tension on hydrogen desorption from the surface layer. The approach is generalizable to other reactant-nanoparticle systems.
authors.affiliation: Department of Applied Physics, Chalmers University of Technology, S-412 96 Göteborg, Sweden.
authors.forename: Christoph
authors.initials: C
authors.lastname: Langhammer
authors.forename: Vladimir P
authors.initials: VP
authors.lastname: Zhdanov
authors.forename: Igor
authors.initials: I
authors.lastname: Zorić
authors.forename: Bengt
authors.initials: B
authors.lastname: Kasemo