3 ms·

> Because electrolysis is highly inefficient Actually it's pretty efficient. According to wikipedia, efficiency ranges from 70% for the cheaper method, to 80%

• bkor 5y ago
  > Actually it's pretty efficient. Electrolysis is only a small factor. It's all of the other required bits that makes Hydrogen so inefficient. Transportation, building up pressure, etc. Hydrogen if you compare things simply is more efficient than gas/diesel. However, gas/diesel is pumped out of the ground. Meaning, a lot of the energy needs for gas/diesel are already there.
  • Diggsey 5y ago
    I was only commenting on electrolysis, I did not make any statement about hydrogen power in general. However, now that you brought it up, the other issues that you mention are very surmountable: - Transport. You can either transport hydrogen via pipelines or simply produce it via electrolysis in-place. You have to get the electricity to the destination somehow, so this doesn't really differ between electric and hydrogen cars. - Building up pressure. Energy required to build up pressure is related to how much the volume is reduced (force x distance and all that...) Conveniently water is almost incompressible, so you can raise the water to the desired pressure cheaply before you electrolyse it. https://en.wikipedia.org/wiki/High-pressure_electrolysis https://en.wikipedia.org/wiki/High-pressure_electrolysis says this can be done at 97% efficiency.
• merb 5y ago
  well theoretical efficiency can never be achived, also it might be more efficient than gasoline cars it can never be more efficient than BEV, because you need to convert power into hydrogen and back, converting anything always has losses