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
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 21201-21207Ämneskategorier
Fysik
DOI
10.1021/jp3059273