FUEL 169 |
| Molecular hydrogen storage by physisorption is appealing because it is reversible, cyclable, and sorbents exist which are tolerant to minor impurities such as water. Two significant drawbacks to hydrogen physisorption, however, are the low temperatures required and the associated system weight implications. To date, most hydrogen physisorption experiments have been conducted at 77.3 K because of the low average isosteric heat of sorption (4–7 kJ/mol) of hydrogen with most materials. Hence, there is a need to consider new hydrogen sorbents with substantially higher average isosteric heats which might store hydrogen at more practicable temperatures. In this paper we present ab initio calculations which suggest that “naked” fluorides may exhibit binding energies with hydrogen which are strong enough to allow persistent physisorption up to higher temperatures. The synthetic challenges associated with incorporating these idealized high energy “binding sites” into real materials will be discussed.
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Hydrogen Storage and Fuel Cell Technology
1:10 PM-6:00 PM, Tuesday, August 21, 2007 Boston Park Plaza -- Cambridge Rm, Oral
Division of Fuel Chemistry |
