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Green Hydrogen To Be Featured In World’s First Nationwide “Hydrogen Valley” (cleantechnica.com)

submitted 2 months ago by [email protected] to c/[email protected]

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The Baltic nation of Estonia has launched an ambitious 100% renewable energy goal for 2030. As part of that goal, energy industry stakeholders plan to showcase the entire country as the world’s first nationwide, integrated “hydrogen valley” hub, with a focus on green hydrogen.

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[–] [email protected] 1 points 2 months ago (2 children)

What you wrote is essentially true of Li+ ion batteries (not truly green unless the electricity is too). The part I was missing was the efficiency of electrolysis being half that of Li+ charging.

Fuel cells can also run cars, and refilling is much faster than recharging. So you can build cars which can go long ranges with quick stops. But of course the infrastructure for hydrogen fuel is well behind even car chargers, let alone gasoline.

[–] [email protected] 3 points 2 months ago* (last edited 2 months ago)

Fuel cells can also run cars, and refilling is much faster than recharging.

It's usually faster, yeah. But honestly I'm not sure which I'd rather have in my cars, explosive Li batteries or explosive highly pressurized hydrogen. Or are we storing liquid hydrogen? Because that seems like an even worse idea.

It sucks that high density energy storage systems are by definition able to release a lot of energy (explosive).

[–] [email protected] 1 points 2 months ago* (last edited 2 months ago)

Fuel cells can also run cars, and refilling is much faster than recharging.

Only for the first few cars. I had a Toyota Mirai through work for a while (contractor company for Toyota, chose the Mirai as a work car, which made my manager think I was crazy. I just wanted something a bit different, and I recognised that this may be the only chance in my life to drive a HFC-EV)

But yeah, back on topic, only for the first few cars at a station. After that, you need to wait for the tank at the refuelling station to repressurise. I was waiting at the station for 5-10 mins before I could even start refuelling a lot of the time. Now imagine if the stations were as busy as petrol stations.

If I recharge a car, I can just plug it in in 5s on my driveway, or spend a couple of minutes paying another charger, then walk off. Refuelling the Mirai was often a 15 minute ordeal of me standing around at a fuel station, not including the out-of-the-way journey to even get to one in the first place.