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Published September 3, 2008 | Supplemental Material
Journal Article Open

Covalent Organic Frameworks as Exceptional Hydrogen Storage Materials

Abstract

We report the H_2 uptake properties of six covalent organic frameworks (COFs) from first-principles-based grand canonical Monte-Carlo simulations. The predicted H_2 adsorption isotherm is in excellent agreement with the only available experimental result (3.3 vs 3.4 wt % at 50 bar and 77 K for COF-5), also reported here, validating the predictions. We predict that COF-105 and COF-108 lead to a reversible excess H_2 uptake of 10.0 wt % at 77 K, making them the best known storage materials for molecular hydrogen at 77 K. We predict that the total H_2 uptake for COF-108 is 18.9 wt % at 77 K. COF-102 shows the best volumetric performance, storing 40.4 g/L of H_2 at 77 K. These results indicate that the COF systems are most promising candidates for practical hydrogen storage.

Additional Information

© 2008 American Chemical Society. Received May 1, 2008. Publication Date (Web): August 7, 2008. Partial support was provided by DOE (DE-FG01-04ER0420 to W.A.G., DE-FG02-06ER15813 to O.M.Y.). The computer facilities of the Materials and Process Simulation Center were supported by ONR-DURIP and ARO-DURIP.

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