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Adsorption of Hydrogen on Carbon Single-Walled Nanotubes as Measured by the Volumetric Technique

Published online by Cambridge University Press:  15 March 2011

Philip A. Parilla ,
Anne C. Dillon ,
Thomas Gennett ,
Jeff L. Alleman ,
Kim M. Jones  and
Michael J. Heben
Philip A. Parilla
Affiliation:
Basic Sciences Center, National Renewable Energy Laboratory Golden, CO, 80401, U.S.A.
Anne C. Dillon
Affiliation:
Basic Sciences Center, National Renewable Energy Laboratory Golden, CO, 80401, U.S.A.
Thomas Gennett
Affiliation:
Department of Chemistry and Center for Materials Science, Rochester Institute of Technology, Rochester, NY, 14623, U.S.A.
Jeff L. Alleman
Affiliation:
Basic Sciences Center, National Renewable Energy Laboratory Golden, CO, 80401, U.S.A.
Kim M. Jones
Affiliation:
Basic Sciences Center, National Renewable Energy Laboratory Golden, CO, 80401, U.S.A.
Michael J. Heben
Affiliation:
Basic Sciences Center, National Renewable Energy Laboratory Golden, CO, 80401, U.S.A.
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Abstract

We report on hydrogen adsorption onto carbon single-walled nanotube (SWNT) material as measured by the volumetric technique. This method determines the amount adsorbed by monitoring the pressure in a known volume at a known temperature with a given number of moles of hydrogen introduced. The raw material for the samples is produced by pulsed laser vaporization of a graphite target containing Ni (0.6 at%) and Co (0.6 at%) dopants. This is followed with a purification procedure and then by a cutting procedure. Finally, the sample is degassed before the hydrogen adsorption is measured. The cutting procedure introduces a titanium alloy which participates in the overall hydrogen adsorption of the SWNT material. Importantly though, the amount of hydrogen adsorbed in the SWNT material cannot be explained by absorption from the alloy alone. A description of the apparatus that has allowed us to measure these samples is given and we discuss crucial experimental procedures needed to activate the SWNT samples for hydrogen adsorption.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 633: Symposium A – Nanotubes and Related Materials , 2000 , A14.36
Copyright
Copyright © Materials Research Society 2001

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