Quote:
Originally Posted by Anthony
If you have lots of surplus energy and don't care about mass, a number of compounds store hydrogen with more density than liquid hydrogen.
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Water is a pretty good one though. Technically you can beat it, but your choices are liquid ammonia or diborane - both of which are somewhat toxic cryogenic liquids, or beryllium hydride or ammonia borane (NH3BH3) which are toxic solids.