this post was submitted on 13 Nov 2023
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A hydrogen engine is so much worse for efficiency than a hydrogen fuel cell, and even that is not good compared to batteries. I'd estimate the round trip efficiency of a hydrogen engine to be about 10-15%. So for the same energy that could be used to drive a battery EV 100km, this car from Toyota could drive 12km.
Additionally, hydrogen is not very energy dense per volume. A compressed hydrogen tank that replaces the boot/trunk of the car would have enough hydrogen for about 100km of range.
Please let me know if I'm wrong about any of these numbers. For Toyota's sake, I really hope I'm wrong.
I thought they were using ammonia powered vehicles and calling them hydrogen just because ammonia contains hydrogen. Wasn't there a bunch of hype a few months ago about Toyota inventing an ammonia internal combustion engine that was so efficient it would "make electric cars obsolete"? The article just mentioned liquid hydrogen though. So I don't know what to believe anymore.
Your numbers are way off. No manufacture would even think about touching hydrogen ICE motors if they only got 10-15% efficiency.
no manufacturer except one that's still desperately trying to push for a hydrogen economy because they invested too much into hydrogen production
Is that what they're doing by releasing one vehicle in a couple of US states and now another in a different country? I think your take is pretty extreme.
For decades, they had been one of the only companies to electrify their vehicles with numerous hybrid options. There doesn't have to be only one single alternative to ICE engines. We can build and develop multiple things in unison.
Uhh, no... hydrogen is the only way forward, unless battery tech magically becomes so much better overnight. We haven't developed a new battery tech over the current stuff since the 70s.
Here's big names who are working on hydrogen cars:
BMW Hyundai Honda Toyota Jaguar
How you going to tell me hydrogen which is the most abundant thing in the universe, is not worth it?
You're the guy hedging his bets on horses and farriers.
EV works for cities but that's about it.
I think the biggest thing that people forgot in the efficiency debate is cost. What will hydrogen actually cost to go 100km compared to electricity
The current cost to drive a car with green hydrogen from electrolysis (not blue or grey hydrogen from methane reforming) is roughly equivalent to $50/L (AUD) for petrol, or $120/Gal (USD) for gas. This is one of the reasons most hydrogen today is made from fossil fuels.
and you have to use it up within a week or two, or your fuel disappears
And yet here we are breaking new ground with brand new (within the year) solid hydrogen projects.
The alternative is the slow charging and short life high cost lithium battery. We need better and efficiency matters not when it’s being pulled from the air in huge stand alone stations now being built.