fig5

Figure 5. Hydrogen adsorption performance of MIL-101(Cr) and GO-based hybrids under high-pressure conditions. Excess H₂ uptake (n_exc, wt. %) at: (A) 77 K, (B) 160 K, and (C) 273 K; (D) Cycles of n_exc at 77 K in gravimetric capacity for the sample M101-GO 1; (E) ρ_tap (kg m^-3) of the samples; (F) Total volumetric H₂ uptake (n_tot) at 77 K; (G) Combined stored volumetric H₂ capacity (kg m^-3), accounting for both compressed and adsorbed phases; (H) Schematic representation of the calculation of the release capacity under different conditions. The isotherms correspond to M101-GO 1; (I) Volumetric H₂ release capacities (kg m^-3), considering charge at 77 K and 100 bar and discharge at 160 K and 5 bar.