[vipa123]

How much energy could possibly be stored in one of those containers? Enough to drive a car 100km? (talk about range anxiety...)

I ask because I know that Hydrogen has terrible energy density per unit of volume, even at scary high levels of pressure (Google says 5.6 MJ/L for compressed hydrogen gas at 700 bar pressure). Compare that with gasoline which is 32 MJ/L (To be clear, I'm not advocating for gasoline as storage medium of energy, just showing the contrast).

[nytesky]

Aren’t these fuel cells? Not gaseous hydrogen you combust?

They should be pretty high density from my googling, and they were a core shuttle technology.

“In common energy sources, the energy density (specific energy) is rough as follows: hydrogen fuel (142Mj/Kg) > natural gas (55Mj/Kg) > petrol (46Mj/Kg) > coal (30Mj/Kg) > lithium batteries (generally no more than 1.8Mj/Kg)”

[thehappypm]

1 kg of hydrogen is roughly 40 kwh of energy - lets assume 50% efficiency to electricity, to reach the energy of a Tesla battery (roughly 100 kwh) you’d need roughly 5 kg of hydrogen. That seems extremely viable as a power source for a car, it can’t be that difficult to compress a few kilograms of hydrogen into a tank..

[vipa123]

142mj/kg is great, but not if you need a bus size volume to hold 1kg