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Large Cryogenic Storage of Hydrogen in Carbon Nanotubes at Low Pressures

Published online by Cambridge University Press:  15 March 2011

B. K. Pradhan ,
A. Harutyunyan ,
D. Stojkovic ,
P. Zhang ,
M. W. Cole ,
V. Crespi ,
H. Goto ,
J. Fujiwara  and
P. C. Eklund
B. K. Pradhan
Affiliation:
Department of Physics, The Pennsylvania State University, University Park, PA16802, USA
A. Harutyunyan
Affiliation:
Department of Physics, The Pennsylvania State University, University Park, PA16802, USA
D. Stojkovic
Affiliation:
Department of Physics, The Pennsylvania State University, University Park, PA16802, USA
P. Zhang
Affiliation:
Department of Physics, The Pennsylvania State University, University Park, PA16802, USA
M. W. Cole
Affiliation:
Department of Physics, The Pennsylvania State University, University Park, PA16802, USA
V. Crespi
Affiliation:
Department of Physics, The Pennsylvania State University, University Park, PA16802, USA
H. Goto
Affiliation:
Honda R&D Co., Ltd. Wako Research Center, Saitama 351-0193, Japan
J. Fujiwara
Affiliation:
Honda R&D Co., Ltd. Wako Research Center, Saitama 351-0193, Japan
P. C. Eklund
Affiliation:
Department of Physics, The Pennsylvania State University, University Park, PA16802, USA
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Abstract

We report (6 wt %) storage of H2 at T=77 K in processed bundles of single-walled carbon nanotubes at P=2 atmospheres. The hydrogen storage isotherms are completely reversible. D2 isotherms confirm this anomalous low-pressure adsorption and further reveal the effects of quantum mechanical zero point motion. We propose that our post-synthesis treatment of the sample not only improves access for hydrogen to the central pores within individual nanotubes, but also may create a roughened tube surface with an enhanced binding energy for hydrogen. Such an enhancement is needed to understand the strong adsorption at low pressure. We obtain an experimental isosteric heat qst=125 ± 5 meV for processed SWNT materials.

Type
Article
Information
MRS Online Proceedings Library (OPL) , Volume 706: Symposium Z – Making Functional Materials with Nanotubes , 2001 , Z10.3.1
Copyright
Copyright © Materials Research Society 2002

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