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The Role of Metal Catalyst in Near Ambient Hydrogen Adsorption on Multi-walled Carbon Nanotubes

Published online by Cambridge University Press:  01 February 2011

Yong-Won Lee ,
Rohit Deshpande ,
Anne C. Dillon ,
Michael J. Hebe ,
Hongjie Dai  and
Bruce M. Clemens
Yong-Won Lee
Affiliation:
Department of Materials science and engineering, Stanford University, Stanford, CA 94305
Rohit Deshpande
Affiliation:
Department of Chemical Engineering, University of Tulsa, Tulsa, OK 74104
Anne C. Dillon
Affiliation:
Center for Basic Sciences, National Renewable Energy Laboratory, Golden, CO 80401
Michael J. Hebe
Affiliation:
Center for Basic Sciences, National Renewable Energy Laboratory, Golden, CO 80401
Hongjie Dai
Affiliation:
Department of Chemistry, Stanford University, Stanford, CA 94305
Bruce M. Clemens
Affiliation:
Department of Materials science and engineering, Stanford University, Stanford, CA 94305
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Abstract

Multiwalled carbon nanotubes (MWNTs) were continuously synthesized by hot wire chemical vapor deposition (HWCVD) using a methane source catalyzed by metal-organic ferrocene. The microstructure of the MWNTs and the catalyst particles were subsequently characterized with transmission electron microscopy which identified three different phases, i.e., bcc α-Fe, fcc γ-Fe and orthorhombic Fe3C. The hydrogen storage capacity of MWNTs was determined with temperature-programmed desorption (TPD) technique. Hydrogen adsorption at near ambient conditions was observed only in as-synthesized MWNTs containing iron particles and was dramatically increased after hydrogen reducing treatment. Possible adsorption mechanism was also discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 837: Symposium N – Materials for Hydrogen Storage – 2004 , 2004 , N3.18
Copyright
Copyright © Materials Research Society 2005

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References

REFERENCES

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