https://doi.org/10.1039/D2MA00143H
“Among different COFs, 3D COFs can be used for gas storage because of their great surface coverage, low densities, and many free sites.31 The same research group used the three-dimensional HNU5 COF as a support for Ag metal and used this silver-embedded COF for CO2 fixation using 2-methylbut-3-yn-2-ol under atmospheric pressure. It was found that the cycloaddition reaction did not work in the absence of Ag nanoparticles, but with Ag@3D-HNU5 COF, the yield was up to 99% with a TON of 990 (Fig. 10).”