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

doi:10.1021/jp040729k

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

Chemistry

Research output: Contribution to journal › Article › peer-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 language	English (US)
Pages (from-to)	2474-2477
Number of pages	4
Journal	Journal of Physical Chemistry B
Volume	109
Issue number	7
DOIs	https://doi.org/10.1021/jp040729k
State	Published - Feb 24 2005

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

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10.1021/jp040729k

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

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.",

author = "Babu, {Panakkattu K.} and Chung, {Jong Ho} and Kuk, {Seung Taek} and Takeshi Kobayashi and Eric Oldfield and Andrzej Wieckowski",

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language = "English (US)",

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T1 - Metallic nature and surface diffusion of CO adsorbed on Ru nanoparticles in aqueous media

T2 - A 13C NMR study

AU - Babu, Panakkattu K.

AU - Chung, Jong Ho

AU - Kuk, Seung Taek

AU - Kobayashi, Takeshi

AU - Oldfield, Eric

AU - Wieckowski, Andrzej

PY - 2005/2/24

Y1 - 2005/2/24

N2 - 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.

AB - 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.

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