Physical Sorption of Molecular Hydrogen by Microporous Organic Polymers

Abstract

The present work describes crosslinked and hypercrosslinked polymers viewed as high surface area materials to adsorb a large amount of molecular hydrogen. Crosslinked polyaniline and polypyrrole were used as examples of hydrogen adsorption by microporous organic polymers. The main reason for physical sorption happening in microporous organic polymers as well the challenges on the way to adjusting the value of hydrogen adsorption enthalpy within the range of 15-20 kJ•mol-1 H 2 are highlighted.

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“…US Department of Energy (DoE) 2025 technical target for onboard hydrogen storage for LDVs is 5.5 kg H 2 (kg system) -1 and 0.030 kg H 2 (L system) -1 , with fill time not longer than 5 min, delivery temperature in the range -40-85°C, and cycle stability of at least 1500 cycles 47 . Material-based storage is a promising way to achieve that goal, realized either by chemisorption on hydrides (metal, complex, and chemical) or physisorption on sorbents, such as carbon-based materials (carbon nanomaterials, fullerenes, activated carbons), zeolites, MOFs, COFs, and polymers of intrinsic microporosity (PIMs) [48][49][50][51][52][53] . Hydrides can absorb even 18.5 wt.…”