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Notes -
It requires either extremely high pressures or extremely low temperatures to store an appreciable amount of energy per volume. That's why rockets use super-cryogenic liquid hydrogen and vehicles use expensive COPV vessels capable of containing thousands of PSI. These problems in themselves are not deal-breakers, but the other hydrogen fuel cells needed to utilize it effectively have stubbornly refused to come down in price, namely I think due to the inability to find a suitable replacement for the platinum catalyst.
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