Impact of preparation and handling on the hydrogen storage properties of Zn4O(1,4-benzenedicarboxylate)3 (MOF-5)

The prototypical metal-organic framework Zn4O(BDC)(3) (MOF-5, BDC2- = 1,4-benzenedicarboxylate) decomposes gradually in humid air to form a nonporous solid. Recognizing this, improved procedures for its synthesis and handling were developed, leading to significant increases in N-2 and H-2 gas adsorption capacities. Nitrogen adsorption isotherms measured at 77 K reveal an enhanced maximum N-2 uptake of 44.5 mmol/g and a BET surface area of 3800 m(2)/g, compared to the 35.8 mmol/g and 3100 m(2)/g obtained for a sample prepared using previous methods. High-pressure H-2 adsorption isotherms show improvements from 5.0 to 7.1 excess wt % at 77 K and 40 bar. The total H-2 uptake was further observed to climb to 11.5 wt % at 170 bar, corresponding to a volumetric storage density of 77 g/L. Thus, the air-free compound exhibits the highest gravimetric and volumetric H-2 uptake capacities yet demonstrated for a cryogenic hydrogen storage material. Moreover, no loss of capacity was apparent during 24 complete adsorption-desorption cycles, while kinetics measurements showed a loading time of 2 min with application of just 45 bar of pressure.