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Hysteretic adsorption and desorption of hydrogen by nanoporous metal-organic frameworks

Zhao, X.B. and Xiao, B. and Fletcher, A.J. and Thomas, K.M. and Bradshaw, D. and Rosseinsky, M.J. (2004) Hysteretic adsorption and desorption of hydrogen by nanoporous metal-organic frameworks. Science, 306 (5698). pp. 1012-1015. ISSN 0036-8075

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Abstract

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.