NMR spectroscopy of hydrogen adsorption on single-walled carbon nanotubes after exposure to high pressure

Hydrogen storage properties of single-walled carbon nanotubes (CNTs) after exposure to a pressure of 14.3 MPa are studied by 1H nuclear magnetic resonance spectroscopy. The nanotubes were carefully pre-characterized using inductively coupled plasma mass spectrometry (ICP-MS), transmission electron m...

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Bibliographic Details
Published in:Solid state nuclear magnetic resonance 2006-02, Vol.29 (1), p.125-131
Main Authors: Pietraß, T., Shen, K.
Format: Article
Language:English
Subjects:
Adsorption
Carbon nanotubes
Hydrogen
Hydrogen - analysis
Hydrogen - chemistry
Hydrogen Bonding
Magnetic Resonance Spectroscopy - methods
Materials Testing - methods
Nanotubes, Carbon - analysis
Nanotubes, Carbon - chemistry
NMR spectroscopy
Pressure
Protons
Surface Properties
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Summary:Hydrogen storage properties of single-walled carbon nanotubes (CNTs) after exposure to a pressure of 14.3 MPa are studied by 1H nuclear magnetic resonance spectroscopy. The nanotubes were carefully pre-characterized using inductively coupled plasma mass spectrometry (ICP-MS), transmission electron microscopy (TEM), and Raman spectroscopy. We have shown previously that at ambient temperature in the pressure range from 0 to 1.5 MPa, hydrogen adsorption is fast and reversible and must be described as physisorption. However, exposure to a much higher pressure (14.3 MPa) of hydrogen leads to slower desorption kinetics where longer exposure causes greater hydrogen uptake. Our data suggest that interstitial sites and the tube interior may be identified as these strong adsorption sites.
ISSN:0926-2040
1527-3326
DOI:10.1016/j.ssnmr.2005.09.011