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Enhancing Hydrogen Adsorption by Metal Incorporation in Carbon Multi-Wall Nanotubes Produced by Continuous Hot Wire Chemical Vapor Deposition

Published online by Cambridge University Press:  26 February 2011

A. C. Dillon ,
P. A. Parilla ,
J. L. Alleman ,
A. H. Mahan ,
K. E. H. Gilbert ,
K. M. Jones  and
M. J. Heben
A. C. Dillon*
Affiliation:
National Renewable Energy Laboratory, Golden, CO 80401 (USA)
P. A. Parilla
Affiliation:
National Renewable Energy Laboratory, Golden, CO 80401 (USA)
J. L. Alleman
Affiliation:
National Renewable Energy Laboratory, Golden, CO 80401 (USA)
A. H. Mahan
Affiliation:
National Renewable Energy Laboratory, Golden, CO 80401 (USA)
K. E. H. Gilbert
Affiliation:
National Renewable Energy Laboratory, Golden, CO 80401 (USA)
K. M. Jones
Affiliation:
National Renewable Energy Laboratory, Golden, CO 80401 (USA)
M. J. Heben
Affiliation:
National Renewable Energy Laboratory, Golden, CO 80401 (USA)
*
*[email protected]
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Abstract

The hydrogen storage properties of carbon single-wall and multi-wall nanotubes (SWNTs and MWNTs), graphitic nanofibers, and other nanostructured carbons have recently become the subject of considerable debate. Reported capacities range from ∼ 0–60 wt%. Hot wire chemical vapor deposition (HWCVD) has recently been adapted for a continuous growth process for high-density carbon MWNTs. Multi-wall nanotube growth is optimized in 1:5 CH4:Ar at 150 Torr with reactor temperatures of 400 and 550°C for static and flowing gases, respectively. Ferrocene is employed to provide a gas-phase catalyst. Highly graphitic nanotubes can be continuously deposited with iron content as low as 15 wt% and carbon impurities below thermal gravimetric analysis detection limits. The MWNTs are simply purified to ∼99.5 wt% with minimal structural damage and with a 75 wt% yield. Hydrogen adsorption is observed for low pressures at near ambient temperatures on the as-synthesized MWNTs containing iron nanoparticles. However, no hydrogen adsorption, is observed at near ambient temperatures for the purified MWNTs or for purified MWNTs that were subsequently combined with iron micro/nano-particles via sonication. These results indicate that an intimate metal/graphitic carbon interaction is required for unanticipated hydrogen adsorption at near ambient conditions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 801: Symposium BB – Materials and Technologies for a Hydrogen Economy , 2003 , BB5.1
Copyright
Copyright © Materials Research Society 2004

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References

REFERENCES

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