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Rapid, Room Temperature, High-Density Hydrogen Adsorption on Single-Walled Carbon Nanotubes at Atmospheric Pressure Assisted by a Metal Alloy

Published online by Cambridge University Press:  15 March 2011

M.J. Heben ,
A.C. Dillon ,
T. Gennett ,
J.L. Alleman ,
P.A. Parilla ,
K.M. Jones  and
G.L. Hornyak
M.J. Heben
Affiliation:
National Renewable Energy Laboratory, 1617 Cole Blvd, Golden, CO 80401-3393 (USA)
A.C. Dillon
Affiliation:
National Renewable Energy Laboratory, 1617 Cole Blvd, Golden, CO 80401-3393 (USA)
T. Gennett
Affiliation:
National Renewable Energy Laboratory, 1617 Cole Blvd, Golden, CO 80401-3393 (USA)
J.L. Alleman
Affiliation:
Chemistry Department, Rochester Institute of Technology, 85, Lomb Drive, Rochester, NY 14623-5604 (USA)
P.A. Parilla
Affiliation:
Chemistry Department, Rochester Institute of Technology, 85, Lomb Drive, Rochester, NY 14623-5604 (USA)
K.M. Jones
Affiliation:
Chemistry Department, Rochester Institute of Technology, 85, Lomb Drive, Rochester, NY 14623-5604 (USA)
G.L. Hornyak
Affiliation:
Chemistry Department, Rochester Institute of Technology, 85, Lomb Drive, Rochester, NY 14623-5604 (USA)
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Abstract

Laser-generated, carbon single-walled nanotubes (SWNTs) adsorb hydrogen in a matter of minutes at room temperature and atmospheric pressure in the presence of a Ti-6Al-4V metal alloy. The unusual hydrogen adsorption properties are activated when the SWNTs are sonicated in nitric acid with a Ti-6Al-4V probe. The process cuts the SWNTs and introduces ∼15-40 wt% metal alloy into the previously pure single-walled nanotube material. Subsequent hydrogen adsorption occurs in two separate sites with a maximum adsorption capacity of ∼7 wt% on a total sample weight basis. Approximately 2.5 wt% hydrogen is evolved at 300 K while the remainder desorbs between 475-850 K. The pure metal alloy adsorbs ∼ 2.5 wt% H2, and evolvesydrogen with increasing temperature in a manner similar to the alloy-doped SWNTs. However, it is clear from studies presented here that the SWNT fraction is quite active in H2 uptake, adsorbing as much as 7 % on a SWNT weight basis.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 633: Symposium A – Nanotubes and Related Materials , 2000 , A9.1
Copyright
Copyright © Materials Research Society 2001

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