This is how hydrogen was justified to those wishing to see it used as an economy.
Electrolysis at 3000 psi is currently the idea, it's 85% efficient at reasonable cell loading.
only issue is you need to cascade gas regulators in order to keep the pressure difference across the membrane to a few psi max.
if you try to use a car battery to generate h2 o2, it's about 40%
if you want to, you could use nicd batteries at 1.5 volts across the cell, at about 60% efficiency.
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