Balancing volumetric and gravimetric capacity for hydrogen in supramolecular crystals
Creators
- 1. Northwestern Univ, Dept Chem & Biol Engn, Evanston, IL 60208 USA
- 2. Northwestern Univ, Dept Chem, Evanston, IL 60208 USA
- 3. Duke Univ, Thomas Lord Dept Mech Engn & Mat Sci, Durham, NC USA
- 4. H2MOF Inc, Irvine, CA 92618 USA
- 5. Univ Hong Kong, Dept Chem, Hong Kong, Peoples R China
Description
The storage of hydrogen is key to its applications. Developing adsorbent materials with high volumetric and gravimetric storage capacities, both of which are essential for the efficient use of hydrogen as a fuel, is challenging. Here we report a controlled catenation strategy in hydrogen-bonded organic frameworks (RP-H100 and RP-H101) that depends on multiple hydrogen bonds to guide catenation in a point-contact manner, resulting in high volumetric and gravimetric surface areas, robustness and ideal pore diameters (similar to 1.2-1.9 nm) for hydrogen storage. This approach involves assembling nine imidazole-annulated triptycene hexaacids into a secondary hexagonal superstructure containing three open channels through which seven of the hexagons interpenetrate to form a seven-fold catenated superstructure. RP-H101 exhibits high deliverable volumetric (53.7 g l(-1)) and gravimetric (9.3 wt%) capacities for hydrogen under a combined temperature and pressure swing (77 K/100 bar -> 160 K/5 bar). This work illustrates the virtues of supramolecular crystals as promising candidates for hydrogen storage.
Files
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Files
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