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

Svetlana Syrenova, Carl Wadell, Tina A. Gschneidtner, Yuri A. Diaz Fernandez, Giammarco Nalin, Dominika ͆witlik, Fredrik Westerlund, Tomasz J. Antosiewicz, Vladimir P. Zhdanov, Kasper Moth-Poulsen, Christoph Langhammer, FERRY ANGGORO ARDY NUGROHO

Research output: Contribution to journalArticlepeer-review

160 Citations (Scopus)

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-30nm 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.

Original languageEnglish
Pages (from-to)1236-1244
Number of pages9
JournalNature Materials
Volume14
Issue number12
DOIs
Publication statusPublished - Dec 2015

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