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Asymmetric Hysteresis in Nanoscopic Single-Metal Hydrides: Palladium Nanorings

Christoph Langhammer (Institutionen för teknisk fysik, Kemisk fysik) ; Elin Larsson (Kompetenscentrum katalys (KCK) ; Institutionen för teknisk fysik, Kemisk fysik) ; Vladimir P. Zhdanov (Institutionen för teknisk fysik, Kemisk fysik) ; Igor Zoric (Institutionen för teknisk fysik, Kemisk fysik)
Journal of Physical Chemistry C (1932-7447). Vol. 116 (2012), 40, p. 21201-21207.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: open 2-phase systems, thermodynamic properties, hydrogen absorption, coherent interfaces, phase-transition, lani5-h2 system, gold nanorings, nanoparticles, isotherms, plasmons



Denna post skapades 2012-11-09. Senast ändrad 2013-02-04.
CPL Pubid: 165795

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Kemisk fysik (1900-2015)
Kompetenscentrum katalys (KCK)

Ämnesområden

Fysik

Chalmers infrastruktur