Developing sustainable transportation technologies is an increasing topic and has highlighted the need for high-density hydrogen storage. Hydrogen usage for transportation is one of the most promising solutions to today’s transportation problem. Considering hydrogen as a non-petroleum energy carrier has several benefits compared to petroleum carriers. Hydrogen has high energy content, gives exhaust products rather than greenhouse gasses and can be derived from a variety of primary energy sources. There is only one obstacle in using hydrogen as a nonpetroleum energy carrier that is the storage of low-density gaseous hydrogen. There are several methods used such as liquefaction and physical compression, however none of these methods are efficient enough to be used. Physical adsorption of hydrogen on large surface areas is one of the most appealing options. New classes of microporous materials called metal organic frameworks (MOFs) are excellent candidates for reversible adsorption of hydrogen considering their extremely high surface areas and tunable structures. Adsorption takes place on the surface of the MOF by means of physical adsorption. This kind of adsorption behavior is called physisorption, which makes it possible to observe totally reversible gas uptake and release behavior. For all the above reasons MOFs are attractive materials for hydrogen storage (1).
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