In Figure g/L, which is 2D COF with the hyw topology, composed of 3,4,9,10-Perylenetetra-carboxylic acid, biphenyl, and 1-cyanopyrene. Interestingly, the high H2 uptake region in the vicinity of M1 is mostly populated by COFs, which can be attributed to their void fraction. To investigate this further, the t-SNE plot in Supplementary Figure is colored according to their void fraction values calculated using ZEO++. The COF structures located within the high H2 uptake region have void fractions ranging between 0.45 and 0.55, which seems to be the optimal range for high H2 uptake performance, as shown in Supplementary Figure . In contrast, M2