Asymmetric Hysteresis in Nanoscopic Single-Metal Hydrides: Palladium Nanorings
Artikel i vetenskaplig tidskrift, 2012

Using direct nanoplasmonic sensing (DNPS), we have studied hydrogen sorption in Pd nanorings with a constant average inner diameter of 240 nm and varying wall thickness. As the main finding we observe an unusual feature above a critical wall thickness in the appearance of a double plateau in the hydrogenation coexistence curve, whereas a single plateau is seen during dehydrogenation for all wall thicknesses. This is the first experimental observation of asymmetric hysteresis in a single metal system. We explain this effect by structural defect-related sample heterogeneity and the interplay of strain-dependent hydrogenation thermodynamics and kinetics.

isotherms

nanoparticles

plasmons

gold nanorings

hydrogen absorption

coherent interfaces

phase-transition

open 2-phase systems

thermodynamic properties

lani5-h2 system

Författare

Christoph Langhammer

Chalmers, Teknisk fysik, Kemisk fysik

Elin Maria Kristina Larsson

Kompetenscentrum katalys (KCK)

Chalmers, Teknisk fysik, Kemisk fysik

Vladimir Zhdanov

Chalmers, Teknisk fysik, Kemisk fysik

Igor Zoric

Chalmers, Teknisk fysik, Kemisk fysik

Journal of Physical Chemistry C

1932-7447 (ISSN) 1932-7455 (eISSN)

Vol. 116 40 21201-21207

Ämneskategorier

Fysik

DOI

10.1021/jp3059273