this post was submitted on 10 Aug 2023
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You'd need huge cryogenic tanks due to the volume density of hydrogen over kerosene. Good for rockets that you can jettison tanks from, but less so for planes. I just don't see it ever being practical for aviation over just creating our own hydrocarbons out of something else. Either catalyst based or otherwise. That's potentially carbon neutral as well.
Edit: my comment, but with numbers https://pubs.aip.org/physicstoday/article/74/9/11/928294/Hydrogen-as-an-aviation-fuel It's not a problem with how heavy the fuel would be or just how much space they'd take. It's how heavy the damn tanks would need to be and how much of the aircraft would be devoted to them on long distance flights.
There was an article around here about Germany ditching hydrogen for their trains, which, if justifiable, seems damning for anything in the air.
As someone from Germany that's the first time in reading that it was ever a thing for trains
Pretty much all our rails have electric lines on top and most trains are working electrically already
I really don't see a point to waste hydrogen on cars or trains where pure electricity is working fine
Planes seems to be the main target that absolutely will never work electrically so it needs hydrogen - there even was an article about a ship running on batteries a couple of days ago