"In fact, many hydrides, including LaNi5H6, store more hydrogen per unit volume than does liquid hydrogen. Furthermore, at modest hydrogen pressures (a few bars), LaNi5H6 releases hydrogen at or near room temperature. Its hydriding kinetics are also acceptable, and laboratory quantities can be dehydrided and rehydrided in 5 to 10 min. The main challenge of metal hydrides is their weight. Because the hydrogen content of LaNi5H6 is only 1.4% by weight (wt%), storing 5 kg of hydrogen would require 360 kg of LaNi5 H6."
http://www.aip.org/tip/INPHFA/vol-10/iss-1/p20.html Stores more hydrogen than liquid hydrogen. Remarkable!
