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Hydrogen can be refueled at home. Electrolysis is pretty damn easy.
by darksaints 7y ago
Hydrogen can be refueled at home. Electrolysis is pretty damn easy.
- masklinn 7y agoCurrently the best electrolysis can do is 50kWh/kg of hydrogen, which is about equivalent to a gallon of gas. That's 7c/kWh to match a $3.6 gallon (as found in CA or HI). And that's before the storage issue is even considered.
- darksaints 7y agoThat's the best that PEM electrolysis can do. Solid oxide cells have been >93% efficient for over a decade now, and some research cells are 99% efficient. If you are willing to supply heat to run in endothermic mode, they are >100% efficient on an electricity basis (meaning they take less than 39kwh of electricity to make a kg of hydrogen, with the rest made up via heat). I personally have made hydrogen with SOECs for $2.72/kg using industrial rates for electricity. After a 60% efficient conversion back to electricity, that comes out to $0.116/kWh, which is better than the residential rates for nearly any state.
- wcoenen 7y agoElectrolysis may be easy, but pressurizing the hydrogen to 700 bar is not. That would probably require a relatively bulky and noisy multistage compressor system.
- darksaints 7y agohttps://en.m.wikipedia.org/wiki/Electrochemical_hydrogen_compressor https://en.m.wikipedia.org/wiki/Electrochemical_hydrogen_com... They're pretty efficient, compact, and also no moving parts and no noise.