Composite MOF Materials
Another approach to increasing adsorption in MOFs is to alter the system in such a way that chemisorption becomes possible. This has been achieved by making a composite material, which contains a MOF and a complex of platinum with activated carbon. In an effect known as hydrogen spillover, H2 can bind to the platinum surface through a dissociative mechanism which cleaves the hydrogen molecule into two hydrogen atoms and enables them to travel down the activated carbon onto the surface of the MOF. This produced a threefold increase in the room-temperature storage capacity of a MOF; however, desorption can take upwards of 12 hours, and reversible desorption is sometimes observed for only two cycles. The relationship between hydrogen spillover and hydrogen storage properties in MOFs is not well understood, but further research in this direction may provide inexpensive boosts in hydrogen storage capacity.
Read more about this topic: Metal-organic Framework
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