Hydride formation thermodynamics and hysteresis in individual Pd nanocrystals with different size and shape



Syrenova, Svetlana, Wadell, Carl, Nugroho, Ferry AA, Gschneidtner, Tina A, Fernandez, Yuri A Diaz, Nalin, Giammarco, Switlik, Dominika, Westerlund, Fredrik, Antosiewicz, Tomasz J, Zhdanov, Vladimir P
et al (show 2 more authors) (2015) Hydride formation thermodynamics and hysteresis in individual Pd nanocrystals with different size and shape. NATURE MATERIALS, 14 (12). pp. 1236-1244.

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Abstract

Physicochemical properties of nanoparticles may depend on their size and shape and are traditionally assessed in ensemble-level experiments, which accordingly may be plagued by averaging effects. These effects can be eliminated in single-nanoparticle experiments. Using plasmonic nanospectroscopy, we present a comprehensive study of hydride formation thermodynamics in individual Pd nanocrystals of different size and shape, and find corresponding enthalpies and entropies to be nearly size- and shape-independent. The hysteresis observed is significantly wider than in bulk, with details depending on the specifics of individual nanoparticles. Generally, the absorption branch of the hysteresis loop is size-dependent in the sub-30 nm regime, whereas desorption is size- and shape-independent. The former is consistent with a coherent phase transition during hydride formation, influenced kinetically by the specifics of nucleation, whereas the latter implies that hydride decomposition either occurs incoherently or via different kinetic pathways.

Item Type: Article
Uncontrolled Keywords: Hydrogen, Palladium, Spectrum Analysis, Kinetics, Thermodynamics, Nanoparticles
Subjects: ?? QC ??
?? QD ??
Depositing User: Symplectic Admin
Date Deposited: 08 Sep 2015 08:14
Last Modified: 19 Jan 2023 07:38
DOI: 10.1038/NMAT4409
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/2024759