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Hydrogen-storing hydride complexes

United States Patent

8,153,020
April 10, 2012
View the Complete Patent at the US Patent & Trademark Office
A ternary hydrogen storage system having a constant stoichiometric molar ratio of LiNH.sub.2:MgH.sub.2:LiBH.sub.4 of 2:1:1. It was found that the incorporation of MgH.sub.2 particles of approximately 10 nm to 20 nm exhibit a lower initial hydrogen release temperature of 150.degree. C. Furthermore, it is observed that the particle size of LiBNH quaternary hydride has a significant effect on the hydrogen sorption concentration with an optimum size of 28 nm. The as-synthesized hydrides exhibit two main hydrogen release temperatures, one around 160.degree. C. and the other around 300.degree. C., with the main hydrogen release temperature reduced from 310.degree. C. to 270.degree. C., while hydrogen is first reversibly released at temperatures as low as 150.degree. C. with a total hydrogen capacity of 6 wt. % to 8 wt. %. Detailed thermal, capacity, structural and microstructural properties have been demonstrated and correlated with the activation energies of these materials.
Srinivasan; Sesha S. (Tampa, FL), Niemann; Michael U. (Venice, FL), Goswami; D. Yogi (Tampa, FL), Stefanakos; Elias K. (Tampa, FL)
University of South Florida (Tampa, FL)
12/ 407,116
March 19, 2009
STATEMENT OF GOVERNMENT INTEREST This invention was made with Government support under Grant Nos. DE-FG36-04GO14224 awarded by the U.S. Department of Energy. The Government has certain rights in the invention.