Asymmetric Hysteresis in Nanoscopic Single-Metal Hydrides: Palladium Nanorings
Journal article, 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
Author
Christoph Langhammer
Chalmers, Applied Physics, Chemical Physics
Elin Maria Kristina Larsson
Competence Centre for Catalysis (KCK)
Chalmers, Applied Physics, Chemical Physics
Vladimir Zhdanov
Chalmers, Applied Physics, Chemical Physics
Igor Zoric
Chalmers, Applied Physics, Chemical Physics
Journal of Physical Chemistry C
1932-7447 (ISSN) 1932-7455 (eISSN)
Vol. 116 40 21201-21207Subject Categories
Physical Sciences
DOI
10.1021/jp3059273