Metallic nature and surface diffusion of CO adsorbed on Ru nanoparticles in aqueous media: A 13C NMR study

Panakkattu K. Babu, Jong Ho Chung, Seung Taek Kuk, Takeshi Kobayashi, Eric Oldfield, Andrzej Wieckowski

Research output: Contribution to journalArticlepeer-review

Abstract

We report the first observation of the 13C nuclear magnetic resonance spectroscopy (NMR) of 13CO, adsorbed from 13CO saturated 0.5 M sulfuric acid solutions, onto the surfaces of commercial Ru-black nanoparticles. The 13C NMR spectra consist of a symmetrically broadened peak having a large Isotropic shift as compared to CO adsorbed onto supported Ru catalysts. The variation of the spin - lattice relaxation rate follows Korringa behavior, indicating the metallic nature of adsorbed CO, in addition to varying across the spectrum in a Korringa-like manner. Motional narrowing of the NMR spectrum at higher temperatures, together with an additional contribution to the spin-lattice relaxation rate, indicate that adsorbed CO undergoes rapid diffusion on the particle surfaces. A two-band model analysis of the NMR results indicates that the CO adsorption bond is weaker on Ru as compared to either Pt or Pd. This is also supported by a reduction in the activation energy for CO diffusion on Ru vs either Pt or Pd nanoparticles.

Original languageEnglish (US)
Pages (from-to)2474-2477
Number of pages4
JournalJournal of Physical Chemistry B
Volume109
Issue number7
DOIs
StatePublished - Feb 24 2005

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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