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Clathrate materials present a novel class of storage media for hydrogen. These unusual crystalline solids are comprised of a lattice of polyhedral cavities that can trap a range of different guest molecules, including hydrogen. We have successfully demonstrated that hydrogen molecules can occupy large cages of clathrate hydrates at higher pressures, covalently bonded silicon clathrate cages, and hydroquinone clathrates. Computer simulations have revealed the mechanisms of clathrate hydrate formation. Storing Hydrogen in Novel Clathrate Materials Craig P. Taylor, Colorado School of Mines, DMR 0820518 Large-cage occupancies of H2 molecules in sII clathrate hydrates, Sugahara, JPCB, 2010 Hydroquinone clathrates for fuel cells, Sachdeva et al. ECS Trans., 2010 H2 storage in silicon clathrates, Baker et al., In prep.