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The development of hydrogen-fueled transportation system and portable electronics will demand new materials that can store large amounts of hydrogen at ambient temperature, relatively low pressures with small volume, light weight, fast charging and discharging time, cyclic stability, and low cost. Hydrogen clathrate hydrate and other molecular compound have hydrogen storage capacity as high as 33.3 wt.%, which develop an innovative way to store hydrogen with exceptionally capacity to meet the DOE long term target (9.0 wt.%). However these clathrate and hydrogen storage compound were synthesized at extremely high pressures and liquid nitrogen temperature. It is unlikely these clathrate hydrates will be practically used for hydrogen storage until we find new clathrate hydrate compounds that can be synthesized and be stable at much lower pressures. We are exploring the possibility of reducing hydrogen calthrate formation pressure through adsorption of hydrogen and water in carbon nanotubes.