Which mechanism limits hydrogen storage capacity in metal-organic frameworks (MOFs) at cryogenic temperatures under high pressure?

💡 Explanation

When pressure increases for hydrogen storage, the chemical equilibrium adsorption of hydrogen on the MOF shifts because of increased hydrogen density. This reduces the number of available favorable adsorption sites, limiting further uptake. Therefore, an equilibrium shift is the result, rather than physical limitations or saturation which depend on the physical properties of the MOF and hydrogen itself.

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