| http://www.w3.org/ns/prov#value | - Also, it has a specific surface area higher than some conventionally known materials such as zeolite, porous silicates, etc.Accordingly, researches on the use of such a COF as a new hydrogen storage medium are in progress.DISCLOSURE Technical ProblemThe inventors of the present invention found that in the case of 2D covalent organic frameworks in which planar layers are sequentially stacked, hydro
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