Size-Dependent Kinetics of Hydriding and Dehydriding of Pd Nanoparticles
Artikel i vetenskaplig tidskrift, 2010

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.

Desorption-Kinetics

Strain

Surface

Hydrogen Storage

Metal Nanoparticles

Small Palladium Particles

Phase

Författare

Christoph Langhammer

Chalmers, Teknisk fysik, Kemisk fysik

Vladimir Zhdanov

Kompetenscentrum katalys (KCK)

Chalmers, Teknisk fysik, Kemisk fysik

Igor Zoric

Chalmers, Teknisk fysik, Kemisk fysik

Bengt Herbert Kasemo

Chalmers, Teknisk fysik, Kemisk fysik

Kompetenscentrum katalys (KCK)

Physical Review Letters

0031-9007 (ISSN) 1079-7114 (eISSN)

Vol. 104 13

Ämneskategorier

Atom- och molekylfysik och optik

DOI

10.1103/PhysRevLett.104.135502