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Originally published in Science Express on 14 October 2004
Science 5 November 2004:
Vol. 306. no. 5698, pp. 1012 - 1015
DOI: 10.1126/science.1101982
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Reports

Hysteretic Adsorption and Desorption of Hydrogen by Nanoporous Metal-Organic Frameworks

Xuebo Zhao,1 Bo Xiao,1 Ashleigh J. Fletcher,1 K. Mark Thomas,1* Darren Bradshaw,2 Matthew J. Rosseinsky2

Adsorption and desorption of hydrogen from nanoporous materials, such as activated carbon, is usually fully reversible. We have prepared nanoporous metal-organic framework materials with flexible linkers in which the pore openings, as characterized in the static structures, appear to be too small to allow H2 to pass. We observe hysteresis in their adsorption and desorption kinetics above the supercritical temperature of H2 that reflects the dynamical opening of the "windows" between pores. This behavior would allow H2 to be adsorbed at high pressures but stored at lower pressures.

1 Northern Carbon Research Laboratories, School of Natural Sciences, Bedson Building, University of Newcastle upon Tyne, Newcastle upon Tyne, NE1 7RU, UK.
2 Department of Chemistry, University of Liverpool, Liverpool, L69 7ZD, UK.

* To whom correspondence should be addressed. E-mail: mark.thomas{at}ncl.ac.uk

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Reversible Concerted Ligand Substitution at Alternating Metal Sites in an Extended Solid.
D. Bradshaw, J. E. Warren, and M. J. Rosseinsky (2007)
Science 315, 977-980
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