Shape-Dependent Interactions of Palladium Nanocrystals with Hydrogen

Anna Klinkova, Pavel V. Cherepanov, Ilya G. Ryabinkin, Martin Ho, Muthupandian Ashokkumar, Artur F. Izmaylov, Daria V. Andreeva, Eugenia Kumacheva

Research output: Contribution to journalArticleResearchpeer-review

19 Citations (Scopus)

Abstract

Elucidation of the nature of hydrogen interactions with palladium nanoparticles is expected to play an important role in the development of new catalysts and hydrogen-storage nanomaterials. A facile scaled-up synthesis of uniformly sized single-crystalline palladium nanoparticles with various shapes, including regular nanocubes, nanocubes with protruded edges, rhombic dodecahedra, and branched nanoparticles, all stabilized with a mesoporous silica shell is developed. Interaction of hydrogen with these nanoparticles is studied by using temperature-programmed desorption technique and by performing density functional theory modeling. It is found that due to favorable arrangement of Pd atoms on their surface, rhombic dodecahedral palladium nanoparticles enclosed by {110} planes release a larger volume of hydrogen and have a lower desorption energy than palladium nanocubes and branched nanoparticles. These results underline the important role of {110} surfaces in palladium nanoparticles in their interaction with hydrogen. This work provides insight into the mechanism of catalysis of hydrogenation/dehydrogenation reactions by palladium nanoparticles with different shapes.

Original languageEnglish
Pages (from-to)2450-2458
Number of pages9
JournalSmall
Volume12
Issue number18
DOIs
Publication statusPublished - 11 May 2016
Externally publishedYes

Keywords

  • hydrogen
  • palladium nanoparticles
  • shape control
  • temperature-programmed spectroscopy
  • thermal stability

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