Researchers have experimented with storing hydrogen inside molecular "cages", made from chains of carbon, oxygen and hydrogen atoms linked by metal ions. These so-called metal-organic frameworks (MOFs) only bond weakly with the hydrogen atoms they enclose, so the gas can be recovered simply by heating the material slightly.
Fraser Stoddart of Northwestern University in Evanston, Illinois, and colleagues have found a way to make MOFs using simple, readily available materials. Stoddart's molecular cages are cubical, and each side is made of gamma-cyclodextrin, a ring of glucose molecules. Produced by bacteria, this sugary starch is used as an additive in many foods and pharmaceuticals – making Stoddart's MOFs edible.
Source: http://www.newscientist.com/article/dn19401-edible-crystals-could-store-hydrogen-fuel.html
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