ABSTRACT
The storage options for hydrogen (including those under investigation) are the following [1]:
• Compressed hydrogen gas (GH2) in cylinders or tanks • Tethered balloons, “bags,” or water displacement tanks (low-pres-
sure GH2) • Hydrogen adsorbed into metal to form a metal hydride (MH) • Liquid hydrogen (LH2) in cryogenic tanks • Adsorption on high-surface-area carbon powder in tanks • Encapsulation in glass microspheres (experimental) • Adsorption on carbon nanotubes (experimental) • In water (H2O; not a “fuel”) • In ammonia (NH3) • In liquid hydrocarbons: gasoline, diesel fuel, alcohol, liquid natural
gas (LNG), propane or butane (LPG), etc. • In gaseous hydrocarbons: compressed natural gas (CNG), biogas, etc.
