Ultrahigh-surface area covalent organic frameworks for methane adsorption.
basic_science · Level V
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- Record sourced from PubMed, PMID 39509500.
- Also identified by DOI 10.1126/science.adr0936.
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Abstract
Developing porous materials with ultrahigh surface areas for gas storage (for example, methane) is attractive but challenging. Here, we report two isostructural three-dimensional covalent organic frameworks (COFs) with a rare self-catenated <b>alb</b>-3,6-<i>Ccc</i>2 topology and a pore size of 1.1 nanometer. Notably, these imine-linked microporous COFs show both high gravimetric Brunauer-Emmett-Teller (BET) surface areas (~4400 square meters per gram) and volumetric BET surface areas (~1900 square meters per cubic centimeter). Moreover, their volumetric methane uptake reaches up to 264 cubic centimeter (standard temperature and pressure) per cubic centimeter [cm<sup>3</sup> (STP) cm<sup>-3</sup>] at 100 bar and 298 kelvin, and they exhibit the highest volumetric working capacity of 237 cm<sup>3</sup> (STP) cm<sup>-3</sup> at 5 to 100 bar and 298 kelvin among all reported porous crystalline materials.