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Published January 2019 | Supplemental Material + Published
Journal Article Open

High-Pressure Hydrogen Adsorption on a Porous Electron-Rich Covalent Organonitridic Framework

Abstract

We report that a porous, electron-rich, covalent, organonitridic framework (PECONF-4) exhibits an unusually high hydrogen uptake at 77 K, relative to its specific surface area. Chahine's rule, a widely cited heuristic for hydrogen adsorption, sets a maximum adsorptive uptake of 1 wt % hydrogen at 77 K per 500 m^2 of the adsorbent surface area. High-pressure hydrogen adsorption measurements in a Sieverts apparatus showed that PECONF-4 exceeds Chahine's rule by 50%. The Brunauer–Emmett–Teller (BET) specific surface area of PECONF-4 was measured redundantly with nitrogen, argon, and carbon dioxide and found to be between 569 ± 2 and 676 ± 13 m^2 g^(–1). Furthermore, hydrogen on PECONF-4 has a high heat of adsorption, in excess of 9 kJ mol^(–1).

Additional Information

© 2019 American Chemical Society. ACS AuthorChoice - This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes. Received: November 16, 2018; Accepted: December 18, 2018; Published: January 7, 2019. This work was supported as part of EFree, an Energy Frontier Research Center under Award no. DE-SC0001057. This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. The authors declare no competing financial interest.

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Supplemental Material - ao8b03206_si_001.pdf

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