Adsorbent-Bed Hydrogen Loading Controls Cryogenic Hydrogen Storage-to-Pressure Delivery

Conventional mechanical and metal-hydride compression can complicate thermal integration with liquid-hydrogen refueling. Here, we assess cryogenic physisorption compression using Ni-DGIST-14. Measured 20 K uptake yields volumetric loadings of 72 and 40 g L–1 under crystallographic and measured powder bulk density assumptions, respectively. Van’t Hoff extrapolation links these loadings to pressure generation during heating, predicting 900 bar at 128 and 315 K. These conditional predictions suggest that shaping to increase bed density while retaining adsorption capacity could enable 900 bar delivery at the specified dispensing temperature of 231 K, identifying densification as a key design objective for physisorption compression.